Take a pan, add 1 tbsp oil, mustard seeds, curry leaves.
Add chopped onions sauté it well for a few mins until the onion turns glossy.
Add ½ tsp Turmeric powder, ½ tsp GaramMasala, 1 tsp chilli powder, 1tsp Black pepper powder and sauté well.
Then add 1 tsp of ginger garlic paste and cook well till the raw smell goes.
Add chopped tomato and sauté well.
Add the Mutton/Lamb liver pieces and salt to taste.
Now, Add ½ cup water and bring it to boil.
Then, cover with the lid and cook well until the liver gets soft.
Now add grated coconut (optional) and fry it in low flame until curry gets completely dry.
Then, add coriander leaves to garnish and turn off the flame.