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Fermenting Idli Dosa Batter In Cold Climate

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Idli Dosa Batter is one of the most common things in my house apart from my parathas. Traditionally the batter differs but I make one. Fermenting Idli Dosa batter is easy if you follow some tips and tricks.

Fermented Idli Dosa Batter

Idlis are steamed savoury cakes originating from South India. Dosa is a savoury crepe made using either the same or different batter. The most common Idli batter is using Rice and Black lentils/gram.  


Making and Fermenting Idli Dosa batter at home is easy and not that difficult. I know everyone dreads the batter part and most of them even buy the ready ones. However, it can be easily done at home. Yes, it takes a bit of time to grind the batter, but once you start doing it you will not turn back.

Fermented Idli Dosa Batter

I never buy or hardly have bought the ready ones except in case of emergencies. The reason we never liked the Idli batter.

Secondly, I just do not make one type of Idlis. I can say that I make more than 10-15 different types of Idlis and the variety is increasing every other day. No, I am not talking about just adding vegetable purees to the same Idli batter, but using different types of batters. I use a range of different grains, dals, and cereals to make different types of batter.

Inside Texture of Fermented Idli Dosa Batter
Inside Texture of Fermented Idli Dosa Batter

Types of Idlis I make

The typical or the first type of Idlis I learnt from my mom is this traditional Idli using Rice and Urad dal and this one, which uses no rice. I.e. the Split Green Moong Dal Idli. It used to be common in our house on at least 1 Sunday of a month. Another rice-free Idli I make is this No Rice Kulith Idli.

I like to make this millet idlis, using whole millets. Bajra (Pearl Millet) and Ragi Idli using whole Ragi Seeds are one of them. I have a few more idli recipes that I make frequently, like using quinoa and more millets. Hopefully, I will share soon.

Split Green Moong Dal Idli | No Rice Idli

Instant Idlis or Veggies Stuffed Idlis

Few more no rice and Instant Idlis on my blog are this Instant Oats and Dali (Broken Wheat/Cracked Wheat) Idli, or this Instant Ragi Idli or Instant Carrot Semolina Idli and Instant Semolina and Vermicelli Idli. Paneer is stuffed in this Palak Paneer Stuffed Idlis and Beetroot is sneaked in this Beetroot Idli/Uttapam batter.

Different Fermented Idli Batters

With fermented batters I do make, Ragi Idli, Quinoa Idli, Little Millets Idli, Jowar Idli, Horse Gram Idli (2 Varieties), Bajra Idli and many many more. I have been making this for the last few years and hopefully will share the recipes sooner. Most of the time, I am not able to click before they are all gone. As said earlier I use the same batter for Dosa and uttapam too. I make Sada Dosa, Masala Dosa, Instant Ragi Dosa

Fermented Horse Gram Idli Dosa Batter
Fermented Horse Gram Idli Dosa Batter
Fermented Ragi Idli Dosa Batter
Fermented Ragi Idli Dosa Batter

Fermenting Idli Dosa Batter

So without diverting further let’s get back to the core of the topic today Idli Dosa Batter. I am no expert and not a South Indian, but this is with my experience and learning over the years. I might be wrong, but whatever I am saying below has worked for me. 

Common Problems people face are

  1. Batter not getting fermented and specially in cold countries.
  2. Idlis are not turning soft and have not puffed up. 

Let’s address the first problem. I am currently living in a cold country. The temperature here is generally below 15. If it goes above 15 C it is considered a hot wave, even in summers. So you can understand how difficult it would be for me. I have made my batter this whole winter and temperatures were anywhere between -7 to 5 C and with hardly any Sun.

Still I manage to ferment my batter every time. How I do this?

  • Earlier I used to Soak the rice and dal together and make a batter. Call it my laziness. Yes my mom used to do it separately, still I did not. I never faced an issue back in India with this method, but here I do. So why really you have to soak them separately. Simply because they both are different types of grains. Grind the dal smooth and fluffy. This helps the batter to ferment well.

  • Add water only as much as needed to grind the dal smoothly. Scraping the sides of the mixie bowl helps. Add a tablespoon at a time.

  • If you are making only dosa it would be still fine to soak them together, but if you are making idlis, it is better to soak them separately.

  • I always use 3:1 as the rice and dal ratio, for non rice idlis too, it is 3:1 with 1 part of urad dal generally. (Have mentioned in individual

  • Idli/Dosa post the ratio, please follow them accordingly). 

  • I use split or whole urad dal and even the black variety at times. 

  • Idli rice is the rice I use for all my batters. I used to use the Ukada rice variety back in India. At times I even use the Kerala red raw rice variety.

  • I add fenugreek as it helps in digestion.

  • I do not like to add soaked poha and leftover rice to the batter as it changes the consistency of the batter. We love our Idlis a bit grainy. But it does help in the fermentation process so you can add around ¼ cup of soaked poha or used rice while grinding if you want. 

  • Adding Soaked Poha also helps in making the dosa cripsy. But if the batter is well fermented it will make crispier dosas.

  • I use my regular mixer grinder to grind the batter. I do not have the special mixer and grinder.

  • Mix the whole batter thoroughly using your hand for a good 2-3 minutes. Do not worry, just clean your hand and do it. Hands are your best friends in cooking. Mixing the batter with your hand really helps, so do not skip this process.

  • The batter needs a good warm environment to ferment well.

To create a warm environment one can do the following:

  • Wrap a blanket around the container and keep it in a place in your house where it is warm. Even if you get a tiny bit of sunlight it is fine. I do not like this only because if it overflows it spoils the blanket.

  • Keep the container in the oven, with oven light on for 2-3 hours. It is not needed for the oven light to be on for the whole time or for hours. It is simply a waste of resources according to me. Once it is on for 2-3 hours, it creates a warm environment sufficient enough to ferment the batter. The below batter is fermented with oven light on for just 2-3 hours.

  • If you have done any baking at all in the oven, your oven would be hot on that day. So one of the best uses of the remaining energy. Let it cool down a bit, so that it does not scorch the batter. Once it is warm, keep the batter inside.

  • Warm the oven slightly (you should just be able to feel it warm and not hot) switch off and keep the batter inside it. The warmth generated is sufficient to ferment the batter.

  • For the last 1 month, I have been following another trick. I keep the batter near one of my heater radiators. In this way I am not wasting any resources and I am happy with the fermentation.

  • Mind you I have tiles in my kitchen and my kitchen is cold.

  • I used to add salt earlier but now I just add ¼ of the required quantity before fermentation. Adding salt helps in the fermentation process, especially in cold countries. If you are in a hot environment skip adding salt earlier. Add it only after the batter ferments. This helps in the batter staying good for long.

  • Time required will be around 16-24 hours in colder countries. It will not ferment just overnight or 6-8 hours. So be patient.

  • If you are keeping it in an Oven, do not open the oven door. All the heat generated will be escaped.

  • Do not close the container tightly, just a loose lid on top.

  • Try to use a steel or a glass container for the batter.

  • Lastly do not forget to keep a plate or a tray at the bottom. If the batter overflows you would be in a mess.
  • Few of my readers told me that they put a hot water-filled bottle in the batter and it helps in fermenting. I have not tried it yet.

Storing and Using After Fermentation

  • Once the batter is well fermented mix, add salt and use as required.

  • The batter keeps good in fridge for 4-5 days. I have not used beyond that as it gets over by then.

  • Once stored in fridge it is advisable to remove it and keep it for at least 30 mins outside and then make Dosa. I do make it immediately at times too due to lack of time.

  • For Idlis the consistency is a bit thick And for Dosa a bit thinner.

  • To make Uttapam, I use Idli consistency batter.
  • Make Idlis’s the first day and dosa or uttpaam the day after. The dosa’s would be more crispier and would taste better after 2 days.

Follow the above and I am sure you would be able to successfully ferment the batter in cold places too. Also, you would be able to solve the second problem of getting soft and fluffy Idlis always.

If you have any more tips or tricks to ferment the batter, do let me know in the comment section below. It will help me and the readers of my blog.

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Fermenting Idli Dosa Batter In Cold Climate using the tips and tricks mentioned here will everytime yield you soft and delicious Idlis and crispy dosas.
Fermented Idli Dosa Batter

Basic Idli Dosa Batter & Fermenting Idli Dosa Batter In Cold Climate

Fermenting Idli Dosa Batter In Cold Climate using the tips and tricks mentioned here will everytime yield you soft and delicious Idlis and crispy dosas.
4.91 from 10 votes
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Course: Breakfast, Dinner, Lunch
Cuisine: Indian, South Indian
Keyword: Batter, Dosa, Fermented, Idli
Author: Renu Agrawal-Dongre


  • 1 Cup Urad Dal
  • 3 Cups Idli Rice / Ukda Chawal /Rice
  • 1/4 tablespoon Salt (Read above on how much you can add or skip)
  • 1 tablespoon of Methi Dana (Fenugreek Seeds)


  • Wash the Urad Dal and methi in water for 2-3 times.
  • Separately wash the rice in water for 2-3.
  • Soak the Urad dal and methi in one bowl, and Rice in another bowl.
  • First grind the Urad dal with minimum water to fine and fluffy consistency.
  • Grind the rice too with minimum water.
  • Add 1/4 tablespoon of salt and mix everything with hand for at least 2-3 minutes.
  • Keep it in a warm location for 8-20 hours (depending on location, read above)
  • Once fermented make Idlis or Dosas as required
Tried this recipe?Share your feedback @cookwithrenu_ad or tag #cookwithrenu
Made it? Upload Your photosMention @cookwithrenu or tag #cookwithrenu
Tried this recipe?Share your feedback @cookwithrenu or tag #cookwithrenu


I have already shared the basic Idli Dosa batter earlier. However, I have not shared all my ways to ferment the batter. Today I am updating my post for the same.

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Recipe Rating


Sunday 4th of December 2022

Please get to the point without thousands of lines which is completely unrelevant to the title of the blog. I don't know why all food bloggers post like a university student writing semester exams, not relevant to the topic just filling pages.

I scrolled so many paragraphs that included ads, finally when I got to the paragraph, there's a pop up asking me to subscribe to your blog, there's not even a close button to close the pop up. Extremely irritating

Renu Agrawal Dongre

Sunday 4th of December 2022

Thank you for stopping by. If you do not like reading that is fine, You might not need the info, but some others need it. Unfortunately, people do not complain when they see a live show and have ads running for a long. Ads are a way to source my blog. There are a lot of inputs needed to run a blog. Hope you understand. Another thing is there is a Jump-To-Recipe button, which will take you directly to the recipe card, you can click on that. With respect to pop-ups, there is a close button, I have tested it. Thank You again, for your detailed comment.


Monday 14th of November 2022

On the top of above tips, if you are grinding the batter in mixer grinder instead of wet grinder, I would suggest putting the soaked dal and rice in fridge for 30 minutes just before grinding it, to avoid heating of the batter during grinding(in mixer grinder) because if dal gets heated, the fermentation process would be delayed.And after mixing the batter with hands put a dried red chilli with stalk( the stalk should touch the batter) and leave it in the preheated oven overnight. My batter is fully fermented and sometimes overflowing in less than 20 hours. Thank you.

b b

Thursday 9th of February 2023

@Renu Agrawal Dongre, Hi, Renu, Swapna said not to get the batter too hot. Since this page is about how to keep the batter warm enough, I was wondering about the opposite question--if I put some batter in the sun on a warm day to hasten the fermentation, do I risk the batter getting too warm? Thank you for your blog to give beginners like me some confidence!

Renu Agrawal Dongre

Tuesday 15th of November 2022

Thank you for your input Swapna.

Kalpana Viswanathan

Monday 19th of September 2022

Hi Renu Thanks for the detailed instructions. I am interested in the trying out the different rice free idli varieties that you have posted. Regarding fermenting, I had tried most of the oven light/ warm oven techniques as I also live in the Northeastern USA and the batter fermentation was a challenge. As you said the fermentation took longer and I also felt the batter was not smelling good after nearly 15 h sitting outside for fermenting. Instead I decided to give this technique a try and it has worked like a charm every time with my batter fermenting within 10 h without the dreaded smell. The only trick I follow is soak the rice one day before the urad daal and change the rice water couple of times before grinding. I don’t have to do this i summer. However, 9 months in a year the weather is cold enough that I have had to follow this and the idlis have consistently come out well. In fact, my in-laws from India had good words about the texture and taste of the idlis. We consume idlis/ dosas pretty much every other day and keep the ground batter for up to two weeks without it getting spoilt. Just thought would share my findings. The oven or Instapot technique works for me for dahi. Thanks

Renu Agrawal Dongre

Wednesday 21st of September 2022

Thank you Kalpana. Thanks for sharing your thoughts and your methods. I am soon going to update this post with the way others do fermentation too. It would help us all.


Thursday 17th of March 2022

I put yoghurt with the mixed batter & leave it to ferment. But can you please let me know if I need to keep it out or in the fridge after putting the yoghurt? Thank you in advance.


Sunday 18th of September 2022

@Renu Agrawal Dongre, Hi I like to make my dosa batter with one glass rice, half glass of urad dal, 5 tablespoons of channa dal and fenugreek seeds. If I use 3:1 the dosa would be crispy but I like my proportion as it is healthy and tastes better to my family though it does not make the dosas crisp. Also if i can use millet instead of rice, will that work? Using your fermenting methods? Also please let me know how long I have to soak ruce and dals before grinding? Thanks

Renu Agrawal Dongre

Monday 21st of March 2022

To ferment you need to keep it outside only as it has to be at normal room temperature or warm conditions. Once fermented you can keep it in the fridge.


Thursday 24th of February 2022

Many thanks for the tips, I used 3:1 ratio and i used whole Urid dal. Tip regarding mixing the batter with hand really helped and also putting the lid gently on the pot. I live in UK and here it takes 24 hours for the batter to ferment. But with your tips i get it right every time.

Renu Agrawal Dongre

Friday 25th of February 2022

That is nice to know Sharmilee. At times I too use whole urad dal. I can understand, it is difficult but not impossible. I am in Ireland so almost the same weather. Would you mind even rating the recipe, it helps my blog and fellow readers too.