One tray of 15 delicious beef meatballs in our house made sweet and sour sauce.
Oven: Open lid and bake at 350F until warm and bubbly. Approx 20 minutes from frozen.
Stovetop: Add the meatballs to a large pot and pour the sauce over top. Stir gently and cook over medium-low heat for up to an hour. Stirring occasionally.