Using the Soup setting, choose “low pressure” and cook time 8 minutes.
Allow to cook, making sure to follow all Instant Pot directions regarding venting, etc. Ensure you have enough water to allow the potatoes and lentils to expand, but do not overfill your instant pot. This recipe fit in my 6 quart pot and I filled the water to 3/4 line.
Stir well before serving. Add salt and pepper to taste.