Mix the ground spices with 1 tablespoon of water in a small bowl until a paste forms, then set aside.
Warm 114 g vegetable oil or ghee in a large, heavy pan set over medium heat, drop in the initial whole spices, and let them crackle for 1 minute.
Add 1500 g potato, cut into quarters, and fry for 10 to 15 minutes until nicely browned all over. Lift them out with a slotted spoon and drain on paper towels.
Tip 225 g onion, finely sliced, into the remaining oil and fry for about 5 minutes until medium brown. Add the aromatic spices and fry for 2 minutes more until the onions are deeply browned.
Stir in the ground spices paste and cook for 1 to 2 minutes. Pour in 2 tablespoons of water, add 12 g ginger, peeled and chopped, and 2 tablespoon garlic, chopped, and fry for 30 seconds.
Add 750 g lamb, cut into medium-sized pieces, and sear for 5 minutes while stirring. Stir in 250 g tomato, finely chopped, and cook for roughly 5 minutes until the moisture boils off.
Pour in 750 ml water, season with salt to taste, cover with a tight lid, and simmer over low heat for 1 to 1½ hours until the lamb is tender.
Return the fried potatoes to the pan and simmer until heated through.
Use 50% of the weight and stir in near the end of cooking. Adds warmth and depth since it contains ground coriander, but introduces stronger spices like clove and cinnamon.
Use 50% of the weight mixed with equal parts ground coriander and a pinch of ground cinnamon, ground cloves, and ground green cardamom. Sprinkle near the end for a warming finish.
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.
Cassia bark
Ceylon cinnamon
True cinnamon: thinner, papery quills, milder and sweeter. Use about 1.5 times the weight, and taste.
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.
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 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 40% to 50% of the fresh tomato weight mixed with a splash of water. Imparts a deeper red colour, thicker sauce, and slightly sweeter cooked flavour.