Ingredients

2 tablespoons extra-virgin olive oil

3 tablespoons grainy mustard

3 tablespoons packed light-brown sugar

1 tablespoon cider vinegar

1 1/2 pounds shallots (about 12), root ends trimmed

1 pound medium carrots, cut into 2 1/2-inch pieces

Coarse salt and ground pepper

2 tablespoons unsalted butter

Preparation

Preheat oven to 450 degrees, with rack in middle. In a small bowl, whisk together oil, mustard, brown sugar, and vinegar. In a roasting pan, toss shallots and carrots with mustard mixture. Season with salt and pepper. Arrange vegetables in a single layer and roast until they are beginning to brown and are tender when pierced with a knife, about 40 minutes, stirring halfway through. Stir in butter and serve warm.