Thai Beef with String Beans

Beef with String Beans
2 Tbspn peanut oil
1 clove garlic, minced
1/2 lb beef, sliced very thin
2 cups frozen string beans
3 Tbspn fish sauce
1 tspn stir fry sauce
1 Tbpsn sugar
1/2 green bell pepper, sliced
1/2 red bell pepper, sliced
3 Serrano chilies, sliced
1/4 tspn white pepper

Mix together fish sauce, stir fry sauce, sugar and white pepper in a small bowl. Heat a skillet over medium-high heat. Add the oil and garlic. Saute beef until browned slightly, then remove from pan with tongs. Add beans and peppers to the pan and cook until brightly colored. Add meat and sauce to pan and cook for about 1 minute more. Serve over jasmine rice.

(Adapted slightly from Quick & Easy Thai Cuisine)