Strip any membrane from 500 g liver, rinse it thoroughly, and cut it into roughly 2.5 x 4 cm pieces.
In a wide bowl, whisk together 177 g plain yogurt, 2.5 g ginger, 1 teaspoon garlic, 0.5 teaspoon ground turmeric, salt to taste, and the marinade spice. Coat the liver pieces thoroughly in the mixture, cover, and chill in the fridge for 15 minutes.
Warm 114 g vegetable oil in a heavy-bottomed pan over medium heat. Tip in 300 g onion and cook, stirring frequently, for 5 to 7 minutes until evenly golden brown.
Transfer the marinated liver into the pan and fry for around 5 minutes, allowing any released liquid to completely evaporate.
Sprinkle in 1.5 teaspoon roasted ground coriander and fry for another 2 to 3 minutes.
Pour in 500 ml water, lower the heat, and simmer gently for about 15 minutes until the liver is cooked through, topping up with extra water if needed so around 250 ml of sauce remains.
Take the pan off the heat and garnish with 1 g mint sprigs before serving.
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.
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 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 about 30% of the weight of fresh mint. Rub between your palms to crush before stirring in; the flavour will be more intensely herbal and less bright.