Combine soy sauce, mirin(rice wine), brown sugar, and minced ginger in a bowl. Slice the pork meat in thin strips. Add them into the marinade, stir everything around, cover and store in the fridge for 2-3 hours or overnight.
Heat oil in a wok(or sauté’ pan), sauté’ onion and garlic until soft. Add the marinated pork strips, stir and cook until meat is tender. Stir occasionally.
Stir in broccoli florets, add a little bit of water, then season with a sprinkle of salt and pepper. Continue to cook until the broccoli florets are done. Don’t cook too long to maintain the broccoli’s crunchy texture and green color.