Wash mutton properly, beat curd and marinate the mutton with curd, red chilly powder and salt. Keep it for an hour.
Make a paste of ginger, garlic and green chilly by grinding it in a mixer. Now chop onions and take a cooker, add oil in to it fry the onions till golden brown.
Now pour marinated mutton in it and stir well. When its half cooked, add ginger, garlic, green chilly paste. Then add half of coriander, cook for some time and stir well.
Cover the cooker and cook for some time again then add some leaves for garnishing and garam masala. Close the Cooker and cook the mutton again for some time on a slow flame.
When the mutton is cooked, take serving Bowl transfer mutton in it and garnish with fresh coriander leaves.