Cut the meat into small cubes. Slice the onions. Grind together the green chillies, garlic, ginger, cumin seeds and the coriander. Heat some oil and fry the sliced oinions till well browned. Add the ground masala and saute over high fire. When oil begins to seperate, add the meat and salt to taste. When the meat starts to become tender, add the chopped tomatoes and some water. Simmer the curry for 10 minutes. Bring it to a boil. Eat when hot with plain rice/dal or naan.