- Switch on the Instant Pot on Saute mode for 10 minutes. 
- Add Butter to the inner of the Instant Pot. - 4 tablespoon butter 
- Once it has melted add the chopped leek. Be careful that the butter should not burn. - 3 Leek stem 
- Saute this leek until translucent. 
- Now add in the diced potatoes. - 2 medium-size Russet / Rooster potato 
- Add 3 cups of water, salt and give it a nice mix. 
- Cancel the Saute mode, close the lid of the Instant Pot. 
- Pressure cook on high for 5 minutes. 
- Once done, let the pressure release naturally. 
- Open the lid of the instant pot once the pin has dropped. 
- Using an immersion blender, blend it to a smooth consistency. 
- Add black pepper and saute it for 5 minutes on sautee mode. 
- Switch off and serve hot with a garnish of chives and sour cream.