Marinate the mutton with lemon juice, salt and black pepper powder and set aside for half an hour.
Meanwhile make a fine paste of onion and garlic. Grind the black peppercorns, cloves, coriander seeds and cumin seeds to a fine powder.
Heat oil in a non-stick pan. Add the onion-garlic apste and saute for two minutes. Add the spice mixture and mix well.
Add the marinated mutton, salt and a cup of water, cover and cook on low heat till the mutton is tender. Serve hot garnished with coriander leaves.