INGREDIENTS
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1 large loaf ciabatta (about 3 by 6 by 14 inches; 1 lb.)
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1 16 ounce jar giardiniera (Italian pickled vegetables), drained and chopped
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3/4 cup finely diced salami
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4 slices prosciutto, torn
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1 tablespoon butter
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1 tablespoon flour
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1 cup half-and-half, plus more for thinning sauce
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10 ounces shredded provolone
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1 tomato, chopped
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1/2 cup thinly sliced iceberg lettuce, for garnish