Tamarind powder

Imli

3 g1 teaspoon

9 g1 tablespoon

Tamarind powder ~0.6 g/ml, so ~3.0 g per level tsp.

Instead of Tamarind powder

Tamarind paste
Use about 3 times the weight, loosen with water and simmer; paste has water and less intense dry tang.
Dried mango powder
Use the same weight or a little more; drier and less fruity, add a pinch of sugar.
Lime juice
Use about 5 ml per 1 g powder, or to taste; add near the end and adjust salt and sugar.