Asian Beef with Mandarin Oranges

2 pounds boneless beef chuck, cut into 1⁄2-inch strips
1 onion, thinly sliced
1⁄3 cup soy sauce
1⁄4 tsp salt
1 tsp minced ginger
1 bell pepper, sliced
3 oz pkg shiitake mushrooms, sliced
1 head bok choy, chopped
5 oz can sliced water chestnuts, drained
2 tablespoons corn starch
11 oz can mandarin oranges, drained and syrup reserved
2 cups beef broth
6 cups steamed rice
Place beef in bottom of crockpot. Then add onion, bell pepper, mushrooms, bok choy, and water chestnuts on top of beef. Pour soy sauce over all, then add salt and ginger. Whisk together corn starch and reserved mandarin orange syrup in medium bowl. Stir in beef broth and pour over ingredients in crockpot. Cover and cook on LOW 10 hours or on HIGH 5 to 6 hours or until beef is tender. Stir in mandarin oranges. Spoon steamed rice into shallow serving bowl and spoon beef over rice. 6 servings.