Masor Tenga is a tangy and flavorful fish curry from the northeastern state of Assam in India. It is made with fish (usually Rohu or Catla) cooked in a sour gravy made with tomatoes, lemon juice, and a special ingredient called 'kokum' or 'elephant apple'. The curry is flavored with mustard oil, ginger, garlic, and spices like turmeric and red chili powder. Masor Tenga is best enjoyed with steamed rice for a satisfying and comforting meal.