Heat a non-stick pan on high heat. Drain and rinse the black beans. Finely slice the chilli, coriander stalks, and ginger.
Once the pan is hot, add 1 tbsp of oil along with the ground coriander, cumin seeds, garam masala, black pepper, and turmeric. Mix well and cook for 30 seconds to release the flavours.
Add 2 tbsp of tomato purée and stir thoroughly.
Pour in half of the can of coconut milk, followed by the chopped coriander stalks, ginger, and half of the sliced chilli. Stir to prevent the spices from overcooking.
Add the black beans and the remaining coconut milk, then mix in the tamari. Chop the sugar snap peas or mangetout in half and finely slice the pak choi. Add both to the pan, along with 200ml of water. Stir and bring to a boil. Taste and adjust seasoning by adding more salt, tamari, lemon juice, or chilli as needed.