1 Cup tomato purée
3 Tablespoons brown sugar
2 Tablespoons tomato paste
2 Tablespoons plus 1 teaspoon apple cider vinegar
2 Tablespoons hot sauce, such as sriracha, optional
1 Teaspoon salt
Two 1-pound packages Italian Style frozen meatballs
scallions for garnish
Whisk white grape juice, tomato purée, brown sugar, tomato paste, vinegar, hot sauce (if using), and salt in the insert of a large slow cooker. Add meatballs and stir to coat. Cover and set slow cooker on low for 2 1/2 hours. Stir meatballs to coat with the sauce. Serve meatballs and sauce sprinkled with scallions.