Decide whether your recipe needs tamarind’s flavor only or both flavor and thickness (e.g., glaze vs. curry).
Start with the ratio listed for your chosen substitute, then thin with water until it matches the consistency of tamarind puree in your dish.
Taste after adding the substitute: if it’s too sharp, add a small amount of sweetness; if it’s flat, add salt and simmer 2–3 minutes.
For gritty swaps (tamarind concentrate), dissolve in warm water and strain before using for smooth sauces.
Adjust in small steps: tamarind is strong, so increment by 1–2 tablespoons per batch rather than dumping in more at once.