Rasam

Rasam is a thin, peppery tamarind broth simmered until sharp and clear, often drunk straight from a cup rather than eaten with a spoon. It's South India's digestive soup, traditionally served toward the end of a meal to settle the stomach, and its thin, almost watery consistency is deliberate — rasam is meant to be sipped, not filled up on.

What it really is

Tamarind water simmers with tomato, black pepper, cumin and a tempering of mustard seed, curry leaf and asafoetida fried briefly in hot oil and stirred in at the end — that final tempering is what gives rasam its sharp, immediate aroma the moment it's poured. Unlike a stew, nothing thickens it: the broth stays thin and clear enough to see through, and it's this thinness that lets it be drunk rather than spooned.

Rasam stays thin and peppery where sambar, its close relative, turns thick and vegetable-heavy. Both share a tamarind base and a South Indian tempering technique, but rasam is built to be sipped as a light, digestive finish, while sambar is built to be a substantial dish in its own right — treating the two as interchangeable misses what each one is actually for.

How it's served

• Hot, in a small cup or bowl, often drunk directly rather than spooned.
• Poured over rice at the end of a meal, or served on its own as a starter.
• Alongside sambar, the two served together but playing very different roles.

How to write it on the menu

• It's naturally vegan and vegetarian.
• No major allergens are inherent to the base recipe.
• Say that it's traditionally served at the end of a meal, since a guest expecting a starter soup may not expect that placement.