Beef Stir-fry With Tri-colored Peppers

Ingredients:
1 pound lean beef -- tenderloin
1 teaspoon Sesame oil
1 tablespoon Soy sauce
1/4 teaspoon Garlic powder
1/4 teaspoon Ginger
1/4 teaspoon Cumin
1 cup Onion -- slivered
3/4 cup Green bell pepper
1 Cup red bell pepper
1 Cup yellow bell pepper
2 tablespoon White wine vinegar

Directions:
Trim fat from beef, and cut crosswise into 1/4 inch slices. Heat oil in a wok over high heat until hot. Add beef, soy sauce, and next 3 ingredients; stir fry 3 minutes or until beef is done.

Remove beef mixture from skillet; set aside and keep warm. Place wok over medium-high heat; add onion and bell peppers, and stir fry 5 minutes..

Return beef mixture to skillet; add vinegar, and cook 1 minute.