Wash, clean, and mix the mutton with salt and turmeric. Cook the mutton and keep it aside. Add one after the other, stirring all the time: ginger-garlic paste, sliced onion, green chilies and tomatoes. Fry masala till golden brown. Add rest of the ingredients and fry for 1-2 minutes (except the lemon juice) Add the mutton; stir fry for another 2 minutes. Uncover and dry the masala till the oil evaporates. Add kachampuli and garnish with coriander leaves.