Submerge 400 g dried chickpea in cold water and leave to soak overnight.
Drain the soaked chickpeas and transfer them to a wide, heavy-bottomed pot. Add 4 g tea bag and enough water to submerge the beans completely. Bring to a boil, then put on the lid, drop the heat to low, and cook at a gentle simmer for 1½ to 2 hours until tender. Drain thoroughly and discard the tea bags.
Warm 13.5 g vegetable oil or ghee in a large pan over medium heat. Tip in the tempering cumin and fry for about 1 minute until fragrant and crackling.
Stir in 80 g onion and 7.5 g ginger, cooking for 3 to 4 minutes until softened. Add the garam masala and stir continuously for 1 minute.
Pour in 750 ml water, stir in 240 g tomato, and season with to taste salt. Tip in the cooked chickpeas, dust over the finishing amchoor, and simmer uncovered for roughly 10 minutes until the pan juices have cooked down to a thick, dry coating.
Serve hot, garnished with to taste onion, to taste green chilli, and to taste coriander leaf.
Use equal dry weight; soak for 30 minutes instead of overnight. Cooks much faster and produces a softer, creamier texture rather than firm, whole beans.
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 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 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.