Spices in Sri Lankan cooking

Standard across coastal South Asian cooking, where prawns are turned in turmeric and salt before they meet anything else. It colours them and takes the edge off the iodine note that large prawns can carry.

Add alongside: Garlic, Chilli powder, Lemon

• Turmeric is bitter in quantity and prawns are delicate. A quarter teaspoon for a plateful, not a spoonful.

The everyday yellow rice of South Asia and the Caribbean, and the affordable answer where saffron is the expensive one. It colours reliably and adds an earthiness saffron does not — they are not the same dish.

Add alongside: Cumin, Green cardamom, Bay leaf

• Turmeric is not a saffron substitute in flavour, only in colour. Recipes that say otherwise are describing the look of the pot.

The South Indian tempering: mustard seeds popped in hot oil until they crackle, then potatoes in. Popping is not decoration — the heat destroys the pungency that raw mustard would contribute and leaves a nutty, faintly bitter note instead, which is a different spice from the one that went in.

How: Popped in hot oil until they stop crackling, before anything else goes in

Add alongside: Turmeric, Cumin, Coriander leaf

The two spices that go into the oil first across most of South India, and the order matters: mustard pops, then turmeric goes in off the heat. Turmeric burns in seconds at the temperature mustard needs, and burnt turmeric is bitter in a way no amount of later seasoning fixes.

How: Mustard until it crackles, then turmeric with the pan off the heat

Add alongside: Cumin, Fenugreek, Coriander leaf

• Turmeric goes in after the mustard has popped, not with it.

Sambar is the definitive case and it is structural rather than decorative: without tamarind the dish is a lentil stew. Cooked lentils are soft, starchy and slightly flat, and tamarind supplies an acidity that lifts them and a fruit body that keeps the acidity from reading as sharpness. It goes in early, because tamarind is one of the very few flavourings that gains from a long simmer.

How: Strained tamarind water added to sambar with the vegetables; In rasam, where it is the dominant flavour alongside pepper

Add alongside: Mustard seed, Fenugreek, Turmeric

• Dose by taste rather than by spoon: block, paste and concentrate differ several-fold and no label distinguishes them.

Sour fish curries run from Kerala to Malaysia to Indonesia, and tamarind is the souring agent in most of them. Acid firms the flesh slightly and cuts the oiliness, and the fruit body gives the sauce a depth that lime alone cannot.

How: In a Keralan or Goan fish curry; In a Malay-style sour fish soup

Add alongside: Turmeric, Fenugreek, Mustard seed

• Add it before the fish rather than after — the acid needs time in the sauce, and the fish does not want the extra cooking.

Aubergine is rich and absorbent and turns heavy without an acid to cut it. Tamarind does that job across South Indian and Southeast Asian cooking, and unlike citrus it survives the long cooking aubergine needs.

How: In a South Indian aubergine and tamarind curry; In a sweet-sour braise with jaggery

Add alongside: Mustard seed, Fenugreek, Chilli flakes

The pairing asafoetida exists for in practice. It goes into the tempering that starts or finishes nearly every dal, contributing a savoury allium depth to a dish that often contains no onion or garlic at all, and the tradition attaches a digestive reason to the combination that SpiceHQ records as tradition rather than as a claim.

How: A pinch into hot oil at the start of a tadka; With mustard seed and cumin in a finishing tempering

Add alongside: Mustard seed, Cumin, Turmeric

• It goes into the fat near the end of the tempering — it needs the least time of anything in the pan and burns to acridity in seconds.

Structural in South Indian cooking rather than optional. Lentils are earthy and mild and need aromatics carried in fat to lift them, which is exactly what a tempering does: the leaves crisp in hot oil, their aroma moves into the fat, and the fat is poured over the dal. Sambar, rasam and every everyday dal in Tamil Nadu and Kerala are built this way.

How: Fried in oil with mustard seed and asafoetida and poured over cooked dal; In the initial tempering for sambar and rasam

Add alongside: Mustard seed, Asafoetida, Turmeric

• The leaves must go into hot fat, not into the simmering pot. Boiled, they give up a fraction of what they hold.

The South Indian potato dishes — poriyal, the masala inside a dosa, potato fry — all begin with curry leaves in hot oil, and potato is an ideal carrier because it is starchy enough to hold the aromatic fat and mild enough not to compete with it. The crisped leaves are eaten with the dish rather than removed.

How: Tempered in oil with mustard seed before the potatoes go in; With turmeric and green chilli in a dry potato fry

Add alongside: Mustard seed, Turmeric, Asafoetida

Documented across Kerala, Sri Lankan and Malaysian cooking, and the citrus-family aroma is why: prawns are sweet and faintly iodic and take a citric aromatic well, while the nutty base note of the fried leaf stands up to the chilli and coconut these dishes usually carry. It is a sharper, more resinous partner than lemongrass would be in the same role.

How: Fried in coconut oil at the start of a prawn curry; Tossed through a dry prawn fry at the end with the crisped leaves left in

Add alongside: Turmeric, Mustard seed, Chilli flakes

• Pat the leaves dry before they go in the pan. Wet leaves spit hard in hot coconut oil.

The one pairing in this dataset where the mechanism is not an analogy. Pandan’s dominant aroma compound, 2-acetyl-1-pyrroline, is the same compound that gives basmati and jasmine rice their scent, and it is present in the leaf at far higher concentration. A knotted leaf in the pot therefore does not merely sit alongside the rice — it supplies more of exactly what fragrant rice already smells of, which is why ordinary long-grain rice cooked with pandan reads as a better grade of rice.

How: A knotted leaf cooked in the rice pot and removed before serving; In coconut rice and nasi lemak

Add alongside: Lemongrass, Curry leaf

• Knot the leaf. An intact leaf laid in whole releases very little, because the aroma is held in cells that need rupturing.