Beef and Broccoli Stir-Fry

Ingredients:
1/2 cup soy sauce
2 tbsp lemon juice
1 tbsp. cornstarch
1 tbsp firmly packed brown sugar
1 clove garlic, crushed
1 tsp black pepper
 2 tbsp vegetable oil, divided
2 lb. top sirloin, sliced 1/4 inch thick
1 medium onion,thinly sliced
2 medium heads broccoli
2 tsp grated fresh ginger root

Directions:
1.In a small bowl, combine soy sauce, lemon juice, cornstarch, dark brown sugar, garlic and pepper. Set aside.
2. Heat 1 tbsp vegetable oil in a large skillet or wok over medium-high heat. Add beef and stir-fry until almost cooked through, about 2 minutes. Transfer beef to a plate and cover to keep warm.
3. Heat remaining oil in skillet. Add onion and stir-fry for 5 minutes. Cut broccoli into florets (should yield about 4 cups) and add to skillet with 1/2 cup water. Bring to a boil, cover, reduce heat and simmer for 3 minutes.
4. Return beef to skillet with soy sauce mixture; add ginger. Bring to a boil and cook, stirring constantly, until sauce thickens, about 2 minutes. Serve hot.