Sardine

Use the same weight, cut into pieces. It is oilier, so reduce added oil slightly and cook 2 minutes longer.

Use the same weight. Fry or simmer gently; small fish cook in 3–4 minutes and break easily.

Use the same weight. It is leaner and milder; oil it well and cook 2 minutes less.

Use the same weight, cut into chunks and fry first. Simmer 10 minutes; it gives a soft, saucy texture.

Use 1.2 times the weight. Parboil until just tender, then simmer 10 minutes in the curry; it absorbs the sour-spicy sauce well.

Use the same weight of cooked chickpea. Simmer 5–10 minutes; it gives a firm bite and makes the dish more stew-like.