In a bowl, put ground pork, 1/2 TBSP soy sauce, 1/2 TBSP oyster sauce, black pepper, garlic and pinch of sugar. Mix well. Put 1 TBSP of potato starch. Again, mix well. Set aside.

Cut all veggies in long strips, not to big (except for bean sprouts).

Put frying pan on high heat. Put some oil, cook onion and garlic first for 1 minutes. Add ground pork, cook for 2 minutes. Make sure to break up the pork. Add bell peppers, cook another minute, add the rest of veggies, stir for 1 minute. Put 2 TBSP oyster sauce and 1 TBSP of soy sauce. Stir fry for another minute.

Dissolve 1 TBSP of potato starch with 3 TBSP of water in a bowl. Add the liquid into pan. Mix well for 1 minute.