Chinese Beef And Hot Tomato Stir-Fry
["1/2 lb. lean beef (round steak or flank steak)", "2 or 3 scallion stalks", "2 Tbsp. oil", "1/4 c. beef stock", "1 Tbsp. cornstarch", "1 (10 oz.) can Ro-Tel tomatoes and green chilies, drained and quartered (reserve liquid)", "1/2 tsp. salt or 1 tsp. soy sauce", "3 Tbsp. water"]
["Cut beef against the grain in 1/4-inch slices, then in 1 1/2 to 2-inch strips.", "Quarter tomatoes.", "Cut scallion stalks in 1-inch sections.", "Heat oil.", "Add salt if desired, then scallions and stir-fry until it loses redness.", "Stir in stock and heat quickly.", "Cook, covered, 1 to 2 minutes over medium heat."]
["lean beef", "scallion stalks", "oil", "beef stock", "cornstarch", "Ro-Tel tomatoes", "salt", "water"]