Prepare Meat: Slice the tender meat with some fat into thin slices. Season with salt, black pepper, ground dried ginger, and seven spices. Mix well to coat all meat slices evenly.
Prepare Garlic and Sauce: Crush garlic cloves with a little salt until you get about one spoonful of crushed garlic. In a bowl, mix starch with water, then add soy sauce, brown sugar, a sprinkle of black pepper, crushed garlic, and optional chopped hot peppers. Stir well to combine the sauce.
Prepare Vegetables: Cut the large onion into strips. Cut the colored peppers into slices after removing seeds.
Cook Meat: Heat half a cup of vegetable oil in a pan over medium heat. Add the seasoned meat slices and stir frequently until the meat changes color and the water released from the meat evaporates. Avoid drying out or roasting the meat; cook until the outside is done and water is gone. Remove the meat from the pan and set aside.
Cook Vegetables: In the same oil, add the sliced onions and stir for about 3 minutes until they become translucent and separate. Then add the sliced colored peppers and stir together for another 3 minutes until the peppers wilt but still maintain texture.
Combine Meat and Vegetables: Return the cooked meat to the pan with the onions and peppers. Stir for 2 minutes to allow flavors to meld.
Add Sauce and Thicken: Pour the prepared sauce over the meat and vegetables. Stir continuously and cook for 2 minutes until the sauce boils and thickens, coating the ingredients well.
Serve: Serve hot. This dish can be enjoyed with bread, as a sandwich, or alongside salads, fried potatoes, or pickles.