Heat the oil in a frying pan over medium heat, then add the diced onions. Cook, stirring periodically, until softened. Capsicum, grated raw papaya, and capsicum are now added.
Cook for another 2-3 minutes, stirring constantly, after adding the garlic, turmeric, and cumin. Place in a food processor and blend until smooth.
In a food processor, combine black beans, moong dal, pumpkin seeds, flax seeds, coriander, eggs, and spices. Blend until completely smooth.
Transfer the mixture to a bowl and stir in the soy flour, besan, and salt. Combine all ingredients and shape into 8 patties.
Place a frypan over medium heat, add the oil, and panfry the patties until brown on both sides.
Serve with cucumber yoghurt or a mango and avocado salsa, if desired.