While the meatballs and vegetables are cooking, prepare the sauce.
Add the soy sauce, honey, rice vinegar, and minced garlic to a saucepan. Bring to a boil over medium-high heat
In a small bowl, whisk together the cornstarch and water to make a slurry.
Slowly add the cornstarch mixture to the boiling sauce while stirring.
Continue stirring and boil for 1 minute, or until the sauce has thickened.