Sweet 'N Sour Stir-Fried Beef - cooking recipe

Ingredients

1 lb. beef flank steak
1 Tbsp. cornstarch
1 Tbsp. cold water
3 Tbsp. vegetable oil
1 (8 1/4 oz.) can pineapple chunks, drained
1 medium onion
1/2 c. water
1/4 c. sugar
1/4 c. white vinegar

Preparation

Trim excess fat from beef. Cut beef with grain into 2-inch strips. Cut strips across grain into 1/8-inch slices.