Step 1

Combine the tenderloin tips, garlic, 1 tablespoon of the vegetable oil, soy sauce and Worcestershire in a mixing bowl. Season with salt and pepper and toss to coat the beef thoroughly.Set aside for 15 minutes at room temperature.

Step 2

Heat the remaining tablespoon of vegetable oil in a large, heavy skillet or wok over medium-high heat. Add the mushrooms and stir-fry until lightly browned, 4 to 5 minutes. Add the beef mixture and stir fry until browned on the outside, 2 to 3 minutes for medium rare.

Step 3

Add the tomatoes and scallions and toss to combine. Add the butter and continue cooking just long enough to coat the meat with the pan juices. Remove from the heat.

Step 4

To serve, plate individual servings of rice and top with the steak mixture.