Few weeks before, I seen this recipe in a Bengali Magazine, but made few changes according to my tastebuds. Trust me, it is very delicious with hot phulkas or steamed rice. Just tryout, it will be one of your favourite items.
INGREDIENTS:
250 gm Mutton Liver (goat liver)
500 gm Onion Greens
1 Medium Onion (finely chopped)
1 tsp Ginger Paste
2 tsp Garlic Paste
1 tsp Green Chili paste
1/2 tsp Kashmiri Chili Powder
1/2 tsp Turmeric Powder
1 Cup Chopped Tomatoes
1/2 tsp Black Pepper Powder
1/2 tbsp Lemon Juice
1/2 tsp Butter
3 tbsp Mustard Oil
Salt to taste.
METHOD:
Wash mutton liver, cut into 1/2" pieces. Make those pat dry and set aside.
Wash onion greens nicely and chop into 1" pieces. Keep aside.
Heat oil in a pan or wok. Add chopped onion in it. Fry till onion gets translucent.
Add mutton liver and fry it alongwith onions for 3 minutes. Now add ginger paste, garlic paste, turmeric powder, green chili paste, red chili powder, tomato and salt in it. Fold nicely till tomatoes get mushy and leave oil from the side of the pan.
At this time, add green onions and mix well. Lower the heat now, cover and cook for 5 minutes. Open the lid now, add sugar and sprinkle little water on it. Fold well and cook covered for another 10 minutes or till mutton livers are tender. Switch off the heat and sprinkle black pepper powder, butter and lemon juice on the top. 
Serve with roti, paratha or steamed rice, it's yummilicious!