Put the shallot and mustard seeds in a small bowl. Combine the vinegar, sugar and thyme sprigs in a small saucepan and bring to a boil. Reduce the heat and simmer, stirring, until the sugar dissolves, 1 to 2 minutes. Pour the vinegar mixture over the shallot mixture and stir. Refrigerate 30 minutes.
Preheat the broiler. Spread the asparagus on a rimmed baking sheet; drizzle with the olive oil and sprinkle with the thyme leaves. Season with 1/2 teaspoon salt and a few grinds of pepper and toss until coated. Broil until crisp-tender and lightly browned in spots, about 4 minutes.
Transfer the asparagus to a platter. Discard the thyme sprigs from the shallot mixture and spoon over the asparagus. Serve with the prosciutto.
Tools You May Need
Photograph by Con Poulos
Courtesy of Food Network Magazine
Tools You May Need
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