INGREDIENTS
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1/2 small cantaloupe (about 1 lb)
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2 tbsp. olive oil
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1 tbsp. red-wine or sherry vinegar
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1 tsp. Dijon mustard
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Kosher salt and pepper
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2 bunch arugula
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1/2 small Red Onion
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4 oz. thinly sliced prosciutto
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Crusty bread, for serving