INGREDIENTS
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8 slices bacon
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3 oz (about 1 1/4 cups) grated Gruyère
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3 oz (about 1 cup) grated fontina
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2 tablespoons finely grated Parmigiano-Reggiano
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1/4 teaspoon crushed red pepper flakes (or to taste)
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8 1/2-inch-thick slices Italian bread
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2 medium ripe tomatoes, cut into 1/4-inch-thick slices
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2 tablespoons butter, at room temperature
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1 to 2 large cloves garlic, halved and peeled for rubbing