If using more than 2 pounds of meatballs and you like em extra saucy, I would recommend doubling the chili sauce and the raspberry preserves.
Chili sauce can be found in the Asian section of most grocery stores or in the Ketchup aisle (Heinz makes a great one and one bottle is perfect for this recipe).
Serves 12 or more as an appetizer, serves 4-6 as a main dish.