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["Trim excess fat from meat and slice thinly (which is easier when meat is slightly frozen) against the grain.", "In a large bowl, combine the chopped onion, sliced meat, 1/2 teaspoon of the black pepper, 2 teaspoons of the fish sauce, and the cornstarch; stir well to coat and set aside to marinate (the cornstarch tenderizes and makes the meat ""velvety"").", "Over high temperature, heat a large skillet or wok and - when the skillet is very hot - add the oil (""hot wok, cold oil, food won't stick""); add the marinated meat mixture and saute until the meat is cooked, about 5 to 7 minutes.", "Remove cooked mixture from skillet and set aside.", "Heat the remaining 1 tablespoon oil in the pan and stir fry the minced garlic for 1 minute.", "Add spinach leaves and stir fry for 3 minutes, stirring constantly.", "Add remaining 4 teaspoons fish sauce and tomato, and stir fry 2 minutes.", "Add the cooked meat mixture and remaining 1/2 teaspoon pepper to the skillet, combine well, and cook until heated through and sauce comes to desired consistency (the cornstarch will effect the consistency - you can add a bit of water, broth, or sherry if it becomes thicker than you'd like).", "Serve immediately with hot cooked jasmine rice.", "Note: I've been told that ""the recipe is not exactly Vietnamese, since we actually use minced pork to stir fry water spinach; beef is always more expensive than pork at home - the good cuts are often on their own, or cooked with minimal side ingredients; other cuts go into stews and soups"" so feel free to try this with pork, too!", "Also, when I first made this recipe I really wasn't expecting too much from it - it came out much tastier than I expected, an absolute keeper (especially according to my husband)!"]