Cut the potatoes into small chunks and slightly mash them. Keep it aside.
Blend all the ingredients of puree to form a smooth paste, keep it aside.
Heat oil over medium heat in a non stick heavy base skillet and add cumin seeds.
Allow spluttering and then add turmeric powder, red chili powder, salt and wait for 10 seconds.
Now mix the puree and saute for 2-3 minutes until the raw smell is gone and oil appears on the sides of the skillet.Add potatoes and 2 cups of water.
Simmer it for about 15 minutes.
Aloo curry is ready to serve with rice or roti.