Slit open each mini sweet pepper towards the stem to stuff. Carefully remove seeds. (It is okay if a few seeds are missed.)
Heat a large pan or wok over medium heat. Dry roast gram flour (besan) until it begin to give off a light aroma and turn slightly pink.
In a large bowl, combine coriander, parsley, coriander-cumin powder (dhana jeera powder), dried fenugreek leaves (kasthuri methi)*, gram flour (besan), turmeric powder (hardal powder), chili powder, garam masala, salt, and sugar. Some stuffing will be leftover and used later in this recipe.*(Note: dried fenugreek leaves (kasthuri methi) is optional) Carefully stuff each pepper with stuffing. Pack pepper with as much stuffing as possible.
Heat a large pan or wok over medium heat. Add mustard seeds. When seeds begin to crackle and pop, add curry leaves (neem), dried chilies, and asafoetida (hing). Continue to heat and gently stir for ~1 minute.
Carefully place all stuffed pepper into the pan. Heat for 3-5 minutes, gently toss, add water, cover, and heat for another 5-7 minutes. Add all remaining stuffing and continue to cook for another 5-7 minutes, gently tossing until all peppers are fully cooked.
Transfer stuffed pepper nu shaak into a serving bowl. This dish looks great within copper serving wear as shown. This may be served with lemon wedges, naan, daal, and rice.