Soak shrimp in warm water to cover for 30 minutes; drain. Mince shrimp and combine with remaining meatball ingredients. Set aside for 30 minutes. Shape into 4 large meatballs. Combine sauce ingredients in a medium bowl; set aside.
Add cooking oil to wok or stir-fry pan to a depth of about 2 inches and heat over high heat to 350 degrees F. Add meatballs, turning occasionally; cook until golden brown, about 3 minutes. Lift out and drain on paper towels. Place meatballs and sauce in a pan. Cover and simmer over medium-low heat for 12 – 15 minutes. Place bok choy leaves over meatballs. Cover and simmer 8 – 10 minutes longer.
Remark: For a thicker sauce, transfer bok choy and meatballs to a platter with a slotted spoon. Add cornstarch solution to sauce in pan over medium heat; cook, stirring, until sauce boils and thickens.