Put 1/2 cup of teriyaki marinade & sauce into a measuring cup.
Add the sugar and mix it up until the sugar is dissolved.
Add a little bit of water until the mixture measures 2/3 of a cup.
Add the cornstarch and mix until smooth.
When the meatballs are almost done, prepare a small frying pan with a generous coat of non-stick spray over medium heat.
Add the ingredients from the measuring cup into the pan and whisk constantly until it comes to a boil.
Once bubbling, remove it from the heat.
Pour the tasty teriyaki glaze over the meatballs.
Serve with brown rice, fried rice, veggies, or whatever else you love!