I finally used the last head of Bok Choy tonight by making this recipe. It was really good and I will be making it again!
Beef and Bok Choy Hot Pot
3 cups beef broth
1/3 cup rice vinegar
1/3 cup soy sauce
2 tablespoons brown sugar
1/4 teaspoon ground cinnamon
1 tablespoon vegetable oil
1 pound beef stew meat, cut into bite-sized pieces
1 1/4 cups chopped green onions
1 garlic clove, minced
1 teaspoon minced peeled fresh ginger
2 cups thinly sliced bok choy
1 1/2 cups thinly sliced carrot
2 cups cooked udon noodles
Combine first 5 ingredients, stirring with a whisk; set aside. Heat vegetable oil in a large Dutch oven over medium-high heat; add beef, browning on all sides. Add broth mixture, green onions, garlic, and ginger; bring to a boil. Cover, reduce heat, and simmer for 1 hour and 30 minutes or until beef is tender. Stir in bok choy and carrot, and cook 5 minutes or until tender. Serve beef mixture over noodles.