INGREDIENTS
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1/4 cup tomato paste
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1/4 cup beef stock
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2 cloves garlic, finely chopped
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1 15 ounce can tomato sauce
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3 tablespoons aged balsamic vinegar
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3 tablespoons (packed) brown sugar
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1/2 teaspoon dried oregano
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1/2 teaspoon crushed red pepper
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A few leaves fresh basil, torn
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2 slices white bread, crusts trimmed and bread crumbled
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Milk, for soaking bread
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1 1/2 pounds ground beef and pork combined
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Salt and pepper
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1/4 cup flat-leaf parsley, finely chopped
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2 cloves garlic, finely chopped
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3 tablespoons grated onion or 2 tsp. granulated onion
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1/2 cup grated parmigiano-reggiano
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Olive oil, for drizzling
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8 slices good-quality Italian-American bread with sesame-seed crust, sliced 3/4-inch thick
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Melted garlic butter, for brushing
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8 slices deli-cut mozzarella
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8 slices deli-cut provolone