Quick Beef Skillet

Ingredients

• 12 lb sirloin, cut un thin strips
• 2 tablespoons oil
• 1 medium onion, chopped
• 1 (10 ounce) package frozen green beans, thawed,reserve juice
• 1 green pepper, sliced
• 1 cup sliced celery
• 4 tablespoons cornstarch
• 2 tablespoons soy sauce
• 34 cup water, i use the juice from the mushrooms and water
• 1 teaspoon oregano
• 1 (4 ounce) can mushrooms, reserve juice