Makham — Tamarind Processing Techniques / มะขาม

Central Thai and Isaan primarily — South uses lime more frequently; tamarind trees are planted outside most Thai homes throughout the country

Tamarind (Tamarindus indica) provides the primary souring agent in Thai cooking — fruity, deep acid that is distinctly different from lime's sharpness or vinegar's one-dimensionality. In Thai kitchens, tamarind is used in three forms: fresh pods (ripe, sweet, often eaten as a snack), compressed block tamarind (makham piak, dried pulp with seeds and fibre, reconstituted in warm water), and ready-made concentrate. The block form is the professional standard — you tear off a golf-ball amount, soak in warm water for 5 minutes, then squeeze and press through fingers to extract the thick paste, discarding seeds and fibre. Concentration of the resulting liquid is the critical variable in most dishes.

Tamarind's deep fruity acid interacts differently with fish sauce than lime does — it softens the brininess while adding complexity, which is why pad thai tastes warm and rounded rather than sharp.