In a medium saucepan, add the water, pineapple juice, teriyaki sauce, soy sauce, and brown sugar over medium/high heat. Bring the mixture to a boil, stirring occasionally, then reduce the heat until mixture is just simmering.
⅔ cup water, 1 cup pineapple juice, ¼ cup teriyaki sauce, 1 Tablespoon soy sauce, 1 ⅓ cups dark brown sugar
Add the minced garlic (OR if you're roasting your own garlic, over the saucepan, squeeze the sides of the head of garlic until the pasty roasted garlic comes out). Whisk to combine.