Mom's Teriyaki Chicken or Beef

Mom's Teriyaki Chicken or Beef
Recipe from Mom

1 Cup soy sauce (if using Kikkoman, do 3/4 cup soy sauce and 1/4 cup water)
1 Cup sugar
4-5 Chicken thighs and/or legs or 1 cut up chicken or thinly sliced beef
1 teaspoon fresh ginger grated or 1/2 teaspoon powdered ginger (optional but recommended)
1 Clove of garlic, minced

Mix all ingredients together (make sure the mix fully covers the chicken/beef, if not, make more sauce). Cover and marinate in the fridge for an hour or more (overnight works well or freeze at this point and cook it up at a later date). Put in baking dish, cover, and bake at 350 for 1 hour, turning occasionally. OR cover and cook on the stove. Put on high heat until it comes to a boil. Cover and turn to low heat for about 45 minutes. OR grill it until crisp on the edges.

*Don't have to marinate before cooking, just do all you can.
*Chicken breasts are much tougher than the thigh, you can use it but it's not nearly as good.