Drain 50 g cashew nut, keeping the soaking liquid. Blend the nuts with a few tablespoons of the soaking liquid until smooth; set aside.
Blend 8 g ginger root and 15 g garlic with 2 tbsp water to a smooth paste.
Dry-roast 0.4 g clove, 0.8 g cassia bark and 0.9 g green cardamom pod, seeds only, in a dry frying pan over medium heat for 1–2 minutes, until aromatic.
Cool the roasted spices, then grind them to a fine powder.
Heat 40.5 g vegetable oil in a heavy saucepan over medium heat.
Fry 200 g onion for 8–10 minutes, stirring, until light brown.
Add the ginger-garlic paste and fry for 1 minute, stirring.
Lower the heat and stir in 1.3 g kashmiri chilli powder; cook for 5 seconds.
Add the cashew paste and the spice powder; stir for 1 minute.
On low heat, stir 150 g greek yoghurt into the pan a spoonful at a time.
Cook for 5 minutes, until the sauce thickens and oil separates.
Pour in 466 g whole milk and stir until smooth.
Add 300 g button mushroom, 0.3 g granulated sugar and salt to taste; stir.
Raise the heat to high and bring to the boil.
Lower the heat, cover and simmer for 5 minutes.
Stir in 150 g green pea and 3 g coriander, then turn off the heat.
Use 20% to 25% of the weight (1 g for every 4 to 5 g fresh). Stir into the gravy; adds peppery heat and warmth, though it misses the crisp, zesty kick of raw root.
Use 15% to 20% of the weight (about 1 g for every 5 to 6 g fresh cloves). Whisk into sauces; gives a savoury, toasted garlic flavour without raw pungency.
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 1 g ground for 4 g whole (or 1 small pinch per 2 to 3 whole cloves). Add with spice powders; disperses intense warmth quickly, so use with restraint.
Allspice berries
Use 100% of the weight whole in tempering. Imparts a warm, clove-like aromatic profile combined with hints of nutmeg and cinnamon.
Use about a third of the weight (0.5 g ground for a 2.5 cm piece), stirred in with the ground spices rather than fried whole, since the powder burns quickly.