These popular meatballs are made with ground beef, herbs, and a fabulous sweet-and-sour sauce made with grape jelly and ketchup. Perfect for tailgating, holiday parties, game day gatherings, or potluck lunches, these meatballs are easy to transport and eat keep on warm in the crockpot and provide toothpicks, napkins, and small disposable paper plates. Use cocktail sausages, frozen meatballs, or ground turkey in this recipe instead of lean beef if you'd like. Take a look at the tips and variations section below for slow cooker instructions and more.