Tamarind pulp is the raw fruit, naturally acidic, while tamarind paste is a processed product, often with added ingredients that can slightly alter its acidity. The pulp generally has a more intense, sour flavor and higher acidity than the paste.
Tamarind pulp is the fruit in its natural state, harvested from the tamarind tree. It's characterized by its sticky, fibrous texture and a distinctly sour, acidic taste. The acidity comes directly from the fruit's natural acids, such as tartaric acid. When you buy tamarind pulp, you're essentially getting the raw ingredient with minimal processing.
Tamarind paste, on the other hand, is a processed product made from tamarind pulp. The pulp is typically soaked in water, strained to remove seeds and fibers, and then cooked down to a concentrated paste. Some commercial tamarind pastes may also include added ingredients like sugar, vinegar, or preservatives. These additions can influence the final acidity level. The paste is generally smoother and more convenient to use than the raw pulp. Because of the processing and potential additives, tamarind paste often has a slightly milder and less intensely sour flavor compared to the pulp. The acidity might be lower due to dilution during processing or the addition of ingredients that balance the sourness.
When substituting tamarind paste for tamarind pulp in a recipe, start with a smaller amount of paste than the recipe calls for in pulp, and then adjust to taste. This will help you avoid making the dish too sweet or too mild in flavor.