Boil mutton along with 1 tbsp ginger & garlic paste, salt, pepper and garam masala powder till almost cooked. (Take care not to overcook the mutton as it will be again cooked with the spices.)
Heat oil in a wok and add shahi jeera. Then add chopped onion along with curry leaves and fry till light golden.
Then add 1 tbsp ginger and garlic paste, tomatoes and cook till tomatoes blend with onion.
Now start adding all the spice powders like red chili powder, turmeric, cumin, and coriander powders. Fry for sometime and add tomato puree, red chili sauce and chopped fresh red chili.
Cook for a minute till oil separates and then add boiled mutton pieces along with 1 cup of mutton stock. Mix gently and cook for 5 minutes on medium heat till all the extra water evaporates and looks dry.
Finally, add chopped onion, capsicum, salt, lemon juice, and chopped coriander leaves. Cook for a minute with the lid placed on.
Serve hot with rice or roti.