Fish Tenga is a tangy and spicy fish curry that originates from the northeastern state of Assam, India. The dish is prepared with fish (Rohu or Catla), tomatoes, and a variety of aromatic spices that lend it a unique and delicious flavor. The dish gets its sourness from the use of a souring agent like tamarind or lemon juice. The use of mustard oil and mustard seeds adds a distinct pungent flavor to the dish, making it an absolute favorite among fish lovers.