In a pot combine the grape jelly with the chili sauce; add in the meatballs and simmer for about 45 minutes uncovered or until the sauce has thickened. If you are making my Parmesan meatball recipe use 2-1/2 to 3 pounds lean ground beef or use half beef and ground pork shape. Shape into about 1-inch balls. Place on a baking sheet. Bake in a 350 degree F oven for 20-25 minutes or until cooked through. Place in the prepared sauce.