Crockpot Sweet and Sour Meatballs

Frozen meatballs slow cooked in a sweet and tangy sauce of grape jelly and chili sauce. The party classic.
INGREDIENTS:
2 lb frozen meatballs fully cooked
1 jar (18 oz) grape jelly
1 bottle (12 oz) chili sauce
1 can (8 oz) pineapple chunks optional, drained
DIRECTIONS:
Put the frozen meatballs in the slow cooker.
Whisk the grape jelly and chili sauce until smooth.
Pour over the meatballs and stir.
Add the pineapple if using.
Cook on low 4 hours or high 2 hours, stirring once.
Keep on warm and serve with toothpicks.