Food Facts
Shanghai bok choy has a pale green stalk. Regular bok choy has a white stalk. Both are available in regular and baby size.
For a Thicker Sauce
Transfer meatballs from saucepan to bowl, reserving cooking liquid in pan. Mix 1 Tbsp. each cornstarch and water; add to liquid. Cook and stir with whisk on medium-high heat until thickened. Pour over meatballs; toss to coat.