Wash and drain the mutton pieces. Mix it with 1/2 tsp of turmeric powder and pepper powder each and set aside until you prep the rest of the ingredients
In a deep wok, heat the oil and add the whole spices
Fry for a minute and then add the marinated mutton and stir on a medium-high flame until mutton starts browning
Once the mutton pieces have browned, add the onions and the ginger garlic paste and mix until the onion slices are soft and translucent
Add the remaining spice powders including the garam masala and reduce the flame to medium-low. Keep stirring to ensure that the masala coats the mutton.
Fry for 4-5 minutes until the spices have roasted and then add the yoghurt and salt.
When all the liquid from the yoghurt is cooked off add the garlic cloves.
Again mix and cover the mutton to allow it to cook. This will take anywhere between 45-60 minutes to cook on a medium low flame. Keep stirring every 10 minutes to ensure that the mutton does not catch at the bottom of the pan. If the mix looks like its drying out and risks being burned , add 1/2 cup of water.
Garnish with sliced green chillis and serve hot.