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Using tongs, transfer the steak to a plate and set aside. To the drippings in the pan, add the onion, tomato, and garlic; season with salt, and pepper. Cook and stir it until the onions are soft and the tomatoes start to break down, about 2 to 4 minutes. Return the beef to the pan, add the soy sauce and red wine vinegar. Cook for 1 minute, season with salt and pepper, to taste, and serve.