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Cook asparagus in a covered skillet in 1 inch of boiling water for 5-7 minutes, until crisp-tender. Divide in bunches; roll a slice of prosciutto or other ham around each. Place in an oiled baking dish, dot with butter and sprinkle with grated Parmesan cheese. Bake at 450 for 12-15 minutes until a golden crust forms. Serve.