Marinate chicken with salt, turmeric, chilli and vinegar for 1hour. Take a kadhai heat 1tbsp oil add onion and saute until it turns golden add ginger, garlic,kaju,chilli and tomatoes. Saute together. Take another kadhai add 1tbsp butter add chicken and cook until it turns golden.keep aside.In a mixture grinders take onion mixture and make a smooth paste.

Take a kadhai add 1tbsp oil and 2tbsp butter add garam masala. Then add masala paste and all spices. mix well and stir constantly add curd, salt and sugar. Then add chicken and mix well. Add some warm water and cover it. Cook for 10 minutes. Last add cream and 1tsp butter.