In a pressure cooker add oil ,garlic ,onion for 1-2 min then add tomatoes and masoor dal,salt and chilli powder and 2 cups of water .

Pressure cook for 3 whistles. Once cooled,blend in a mixer to puree, Pour the puree in pan add 2 cups of water ,mix well and cook on medium flame for 2-3 min,add lemon and serve the soup hot