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Gratineed Mustard Creamed Onions

['2 pound white pearl onions', '2 tablespoons unsalted butter', '2 tablespoons all-purpose flour', '1 cup whole milk', '3 tablespoons cream Sherry', '1 tablespoon grainy mustard', '1 tablespoon Dijon mustard', '1/4 teaspoon grated nutmeg', '1/2 cup grated Parmigiano-Reggiano', 'Equipment: a 2-qt shallow gratin or other flameproof baking dish (2 inches deep)']

Cook onions in a large heavy pot of boiling salted water (2 teaspoons salt for 4 quarts water) until just tender, 25 to 30 minutes. Reserve 1 cup cooking water, then drain (reserve pot). Cool onions to warm, then peel.
Melt butter in dry pot over medium heat. Add flour and cook, stirring, 2 minutes. Whisk in reserved cooking water, milk, and Sherry and cook, whisking frequently, until mixture is thickened, about 8 minutes. Whisk in mustards, nutmeg, and 1/2 teaspoon each of salt and pepper. Add onions to sauce and simmer 5 minutes.
Preheat broiler.
Transfer creamed onions to baking dish and sprinkle evenly with cheese. Broil 4 to 5 inches from heat until top is golden brown and bubbling, about 3 minutes.

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