Bombil Machli, Baingan aur Chigur

Use same weight; cut into chunks and simmer gently for 5–8 minutes, depending on thickness.

Use same weight; it holds together better in curry, so simmer 8–10 minutes.

Only if the recipe intends dried Bombay duck; use half the weight, rinse well and add early to the oil.

Use 1:1 by weight. Handles high-heat frying identically and introduces a very subtle, pleasant nuttiness.

Use 1:1 by weight. Yields a much richer, authentic aroma and a glossy, heavier mouthfeel.

Use 1:1 by weight. Heat until smoking, then cool slightly before cooking to temper its intensely pungent, sharp mustard kick.

Use equal weight, finely sliced. Shallots soften and brown faster, giving a slightly sweeter and more delicate base to curries.

Use 80% of the weight, finely shredded and browned slowly with a pinch of asafoetida. Replicates the bulk and natural sweetness in gravies without allium.

Use equal weight; peel and grate very finely on a microplane or pound to a fine paste in a mortar.

Use equal weight; mince finely and crush with the flat of a knife before frying.

Use 20% of the weight; add directly with the dry spice powders, though it yields an earthier, less pungent profile.

Use equal weight; crush or finely grate to a smooth pulp to replicate the same fresh, pungent moisture in your base gravy.

Use 20 to 25% of the weight; mix with a teaspoon of water before adding to oil so it does not burn, noting it lacks the fresh bite.

Use 50% of the weight. Mimics turmeric's warm, earthy, rhizome background, but provides none of the golden-yellow colour.

Steep a tiny pinch (0.1 g per 2 g turmeric) in 2 tbsp warm water; use to match the rich golden hue. Contributes an aristocratic, honeyed floral flavour rather than earthy bitterness.

Use 100% of the weight. Provides direct, sharp heat and red colour in equal measure.

Use 150% to 200% of the weight if matching colour, but add a pinch of black pepper or hot chilli if you need equivalent fiery heat.

Use 75% to 100% of the weight. Offers a sharp, clean heat with slightly less earthy depth and less crimson colour.

Use the same weight; halve or quarter and cook 2–3 minutes longer. They hold their shape better in the sauce.

Use the same weight; slice or cube to the recipe's size. Similar flesh, slightly firmer.

Use the same weight; cube and salt for 10 minutes if the recipe does. It absorbs oil a little more.

Use 10 to 15% of the weight (about 1/4 teaspoon per chilli); imparts dry pungent heat and reddens the dish without the grassy crunch.

Use 1 dried pod per fresh green chilli; snap in half and temper in hot oil for a deeper, toastier heat.

Use 5–10 g for every 50 g leaves, taste and add near the end. It gives sourness but no leafy green texture.

Use 2–3 g for every 50 g leaves, sprinkle in with the spices. It gives dry sourness with no green note.

Use 10–15 g for every 50 g leaves, stir in off the heat. It gives bright sourness only.