The best acid to use in chaats is typically tamarind pulp or lime/lemon juice, as they provide a balanced tartness that complements the other flavors.
The acidity in chaat is crucial for balancing the sweet, spicy, and savory elements. Tamarind pulp, often used in the form of a chutney, offers a complex sweet and sour flavor profile that is a staple in many chaat recipes. Lime or lemon juice provides a brighter, sharper acidity that cuts through the richness of the other ingredients. The choice between tamarind and lime/lemon often depends on the specific chaat and regional preferences. Some chaats may even use a combination of both for a more nuanced flavor. Other less common acids include dried mango powder (amchur) which adds a fruity tang, and pomegranate seeds (anardana) for a burst of sweet-tart flavor. The key is to use the acid judiciously, ensuring it enhances rather than overpowers the other flavors.
When using lime or lemon juice, add it towards the end of the chaat preparation. Adding it too early can sometimes cause certain ingredients to become bitter or lose their texture.