Bhuna (or Bhoona) is a cooking method where spices are fried in hot oil. Usually, onions (or shallots), ginger and garlic are then fried in the oil until they are well cooked and have broken down to form a paste. This bhuna paste is then used to cook the main ingredients, which are meat and/or vegetables, with the addition of tomatoes and capsicum (bell pepper). The typical main bhuna ingredient can be chicken, lamb, prawn and vegetable.
A bhuna curry is usually spicy and can be very hot indeed.
The bhuna sauce is thick, not runny.
Bhuna curries are popular in Bengal (in northeast India) as well as in western Bangladesh.