In slow cooker, stir together tomatoes, 1½ cups of the onions, the chile, raisins, tomato sauce, tomato paste, vinegar, brown sugar, curry powder and ½ teaspoon of the salt.
Cook uncovered on High heat setting 3 hours or until thickened.
Meanwhile, heat oven to 400°F.
Spray 15x10x1-inch pan with cooking spray.
In large bowl, mix sausage, beef, ¼ cup parsley, the egg, remaining ½ cup onion and remaining 1 teaspoon salt.
Shape mixture into 36 (1-inch) balls.
Arrange in single layer in pan.
Bake 15 minutes or until thoroughly cooked and no longer pink in center.
Add meatballs to slow cooker.
Reduce heat setting to Low.
Cover; cook 1 hour.
Sprinkle with additional parsley.
Notes & Wine Advice
Make-Ahead Magic
You can make the sauce and meatballs up to 2 days ahead of time. Spoon cooled sauce and meatballs into large microwavable bowls; stir to combine. Cover and refrigerate. The day of serving, microwave bowls on High 3 to 4 minutes, stirring occasionally, until hot. Transfer hot meatballs and sauce to slow cooker. Cover; cook on Low heat setting 1 hour.