The best acids to use in fish-based curries are typically tamarind, lime juice, or kokum, as they complement the delicate flavor of fish without overpowering it.
When preparing fish curries, the choice of acid is crucial for balancing the flavors and enhancing the overall taste. Stronger acids like vinegar can easily overwhelm the subtle taste of fish. Therefore, milder and fruitier acids are preferred.
Tamarind is a popular choice in many South Indian and Southeast Asian fish curries. It provides a tangy and slightly sweet flavor that pairs well with seafood. To use tamarind, soak a small amount of tamarind pulp in warm water, then strain the liquid to remove any seeds or fibers before adding it to the curry.
Lime juice is another excellent option, offering a bright and zesty flavor. It's best added towards the end of the cooking process to preserve its freshness. A squeeze of lime juice can lift the flavors of the curry and add a refreshing touch.
Kokum, a fruit native to India, is often used in Goan fish curries. It imparts a slightly sour and fruity flavor, along with a reddish-purple hue. Kokum is typically added whole or as a dried rind to the curry.
Other less common but acceptable acids include lemon juice and amchur (dried mango powder), but these should be used sparingly and with careful consideration of the specific fish and other ingredients in the curry.
Always add the acid gradually and taste as you go. It's easier to add more acid than to remove it if you've added too much. Start with a small amount and adjust to your preference.