First boil or steam 2 medium potatoes (160 grams) till they are thoroughly cooked. Allow them to become warm. You can steam them in a pan or electric rice cooker or pressure cook them in 1.25 to 1.5 cups water for 5 to 6 whistles.
When the potatoes become warm, peel and mash them
Add 1/3 cup chopped onion, 1/2 teaspoon chopped green chilies, 1/2 teaspoon finely chopped garlic, 2 teaspoon chopped coriander leaves, 1/2 teaspoon mustard oil and 1/2 teaspoon lemon juice.
Mix very well. Check the taste and add more salt, lemon juice or green chilies if required.
Serve aloo chokha with litti chokha or as a side dish with any north indian meal.