In a large mixing bowl combine all of the meatball ingredients until mixed evenly. Using a scoop portion the meatballs onto the sheet pan. Gently roll each portion into a ball and bake for 15 minutes or until the meatballs start to brown.
While the meatballs are baking heat all of the glaze ingredients except the water and cornstarch in a saucepan and bring to a boil. While waiting the sauce to boil create a slurry with the water and cornstarch. Once the sauce is boiling add the cornstarch slurry and cook until it has thickened.
Transfer the meatballs to a large bowl and pour the glaze over them. Toss or stir to coat. Garnish with additional thinly sliced green onions and sesame seeds.