Boil 400 g peas in a pan of water for 5 to 7 minutes until tender. Drain, return them to the pan, crush thoroughly with a masher, and set aside.
Boil 500 g green bananas in boiling water for 5 to 7 minutes. Drain, leave until cool enough to handle, and peel. Transfer the flesh to a mixing bowl, mash until smooth, and combine with the kofta spice, 3 tablespoon green chilli paste, 1.5 tablespoon garam masala, 2 tablespoon chickpea flour, and salt to taste. Shape the mixture into equal-sized rounds or small cylinders.
Heat 114 g vegetable oil in a deep, heavy pan or kadhai to 180°C (350°F), then turn down the heat slightly. Fry the koftas in batches for 1 to 2 minutes until crisp and golden brown all over. Lift out with a slotted spoon and drain on paper towels.
In a blender or food processor, combine the paste spices with 80 g grated coconut, 24–36 g green chilli, and 25.2 g granulated sugar. Grind to a smooth paste. In a small cup, stir the ground cumin for the sauce with 2 tablespoons of water.
Warm 13.5 g vegetable oil or ghee in a frying pan over medium heat. Add the tempering seeds and fry for 1 minute until popping. Pour in the cumin slurry and cook for 2 minutes. Take the pan off the heat and gradually whisk in 250 g whisked yoghurt.
Set the pan back over the heat, stir in the mashed peas along with the spice paste, and cook for 2 minutes. Pour in 250 ml water, bring to a boil, then drop the heat and simmer gently for 2 minutes. Carefully slip the fried koftas into the gravy and simmer for 2 minutes. Stir in 1 g chopped coriander, take off the heat, and adjust salt to taste.
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.
For crisping batters or binding cutlets: use 50% to 60% of the weight. Produces a very crisp shell but lacks the earthy, roasted nutty flavour of besan.
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.