For easy slicing, place steak in the freezer for 30 minutes.
Cut trimmed steak diagonally into very thin strips.
Sauté steak, green onions, and garlic in hot oil in a skillet until steak is browned. Stir in tomato soup and next 3 ingredients.
Cook over medium heat, stirring occasionally, 10 minutes. Serve over rice, and sprinkle with cilantro, if desired.
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