Once soaked soya beans expand up to triple in quantity.
In the absence of a pressure cooker, cook the beans in an open pot on stove top until well cooked.
This dish can be cooked ahead of time for an even better taste.
Alternatively, fresh or frozen edamame beans would make a good substitute. Skip the soaking part and cook it on stove top until soft. Pressure cooker will make them too mushy.
Use green bell pepper if not for red bell pepper.
Peanuts can be used in place of cashews. Just double the amount and roast before grinding for the paste.
Substitutes will alter the taste, but they will be differently tasty on their own.