An easy and delicious twist on meatballs! These teriyaki meatballs can be served over rice, or pasta, or even a chewy French bread roll for sub sandwiches.
Preheat the oven to 350 degrees F (175 degrees C). Line a baking sheet with foil.
Mix ground beef, bread crumbs, soy sauce, brown sugar, garlic, and egg whites for meatballs together in a bowl until well combined. Form into 1-ounce balls. Transfer to the prepared baking sheet.
Bake in the preheated oven for 25 minutes. An instant-read thermometer inserted into the center should read at least 160 degrees F (71 degrees C).
Meanwhile prepare sauce: Combine pineapple, soy sauce, brown sugar, and pepper in a saucepan over medium heat. Bring to a boil, then reduce to a simmer.
Mix cold water and cornstarch together in a small bowl; add to the sauce. Stir and simmer until desired thickness, 3 to 5 minutes. Add meatballs and cook until heated through, about 5 minutes.