Dice 500 g trimmed liver into 2.5 cm (1 inch) chunks.
Bring 250 ml of water to a boil in a saucepan, add the liver, and cook for 6 minutes. Mix in 50 g whisked plain yogurt, 300 g chopped onion, 24 g peeled and ground ginger, 12 g de-seeded and chopped green chilli, 0.3 g asafoetida, and the simmering spices. Continue cooking until the meat is fully tender and the liquid has cooked away completely.
Transfer the mixture to a food processor or mincer and process to a fine paste. Empty into a mixing bowl, then stir in 50 g chopped coriander leaf, 2 tablespoons rice flour, the kofta spices, and salt to taste until evenly combined.
Divide the mixture and roll into 15 to 20 equal-sized balls.
Heat 150 g ghee or vegetable oil in a kadhai or deep pot to 180°C (350°F). Fry the koftas in batches for roughly 5 minutes, turning until evenly golden-brown, then lift out with a slotted spoon to drain on paper towels.
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 300% to 400% of the weight (e.g. 3–4 g paste for 1 g ground). Fry in oil alongside onions; provides a juicy, pungent kick rather than a dry, baking-spice heat.
Peel and grate finely; use 300% to 400% of the weight. Add to the hot oil early; delivers bright, peppery warmth rather than the mellow, woody heat of dry ginger.
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 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.