Oriental Pepper Steak

Ingredients

• 1 1/2 lb. (1 inch thick) sirloin steak (I use sirloin tip roast and have them slice it really thin)
• 1/4 c. vegetable oil
• 1 clove garlic, crushed or 1/4 tsp. garlic powder
• 1 tsp. salt
• 1 tsp. grated fresh ginger root
• 1/2 tsp. freshly ground black pepper
• 2 1/2 c. chopped green peppers
• 2 c. chopped white sweet onions
• 1/2 c. soy sauce or more to taste
• 1 tsp. sugar
• 1 c. beef bouillon or broth (from meat when you stir-fry it)
• 1 (6 oz.) can water chestnuts
• 2 c. mushrooms, sliced
• 2 Tbsp. cornstarch, dissolved in beef broth
• 6 green onions with tops, cut into 1-inch pieces