Meatball Sliders
INGREDIENTS
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1
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red onion cut into thin wedges (1 1/2 cups)
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2
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12 ounce package frozen cooked Italian meatballs (24)
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1
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24 - 26 ounce jar marinara or pasta sauce (about 2 1/4 cups)
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1
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tablespoon balsamic vinegar
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1/2
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teaspoon crushed red pepper
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6
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slices provolone cheese, quartered (6 ounces)
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4
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roma tomatoes, sliced
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24
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cocktail buns, split and toasted, if desired
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