Masor Tenga is a popular fish curry from Assam, a state in Northeast India. Tenga means sour, and Masor means fish, so Masor Tenga is a sour fish curry. It is made using a variety of fish, including Rohu, Catla, or Tilapia. The dish is typically prepared by first marinating the fish in a mixture of turmeric, salt, and mustard oil. The fish is then pan-fried until it is crispy on the outside and soft on the inside. The fish is then added to a sour gravy made with tomatoes, lemon, and other spices.