Yes, amchur powder can often substitute tamarind in North Indian cooking, providing a similar sour and fruity flavor profile. The substitution ratio is generally 1/2 teaspoon of amchur powder for every tablespoon of tamarind pulp.
Amchur powder, made from dried unripe mangoes, offers a tangy and slightly sweet flavor that mimics the sourness of tamarind. While tamarind has a more complex, fruity, and slightly molasses-like taste, amchur provides a bright, acidic punch. When substituting, consider the dish's overall flavor profile. For dishes where tamarind's sweetness is crucial, you might need to add a touch of sugar or jaggery to balance the acidity of the amchur. Start with a smaller amount of amchur and adjust to taste. Remember that amchur's flavor is more concentrated, so less is often more. The best way to substitute is to add amchur powder gradually, tasting as you go, until you achieve the desired level of sourness.
When using amchur powder, add it towards the end of the cooking process. Cooking it for too long can make it taste bitter.