Mince the garlic, dried shallots, and ginger separately. Wash the tomatoes and cut them into wedges. Clean the beef ribs and cut them into bite-sized pieces. Place the ribs in a bowl, add a little pepper, seasoning powder, minced garlic, and ginger. Mix well and marinate the ribs for about 20-30 minutes to absorb the flavors.

Place a pot on the stove, add 1 tablespoon of cooking oil, and heat it. Add the marinated beef ribs and stir-fry until they are browned. Pour in enough water to cover the ribs and simmer until the ribs are tender. When the ribs are almost done, heat a pan on the stove with 1 tablespoon of cooking oil. Sauté the dried shallots until fragrant. Add the tomatoes and stir-fry until soft, then add the pickled mustard greens. Season with seasoning powder to taste and stir-fry until the greens are cooked, then turn off the heat.