ROASTED SWEET-POTATO SPEARS WITH BACON VINAIGRETTE

Roasted Sweet-Potato Spears with Bacon Vinaigrette image

Yield Makes 8 to 10 servings

Number Of Ingredients 8

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4 pounds medium sweet potatoes (about 7)
1/2 pound sliced bacon, cut crosswise into 1/2-inch-wide strips
1 teaspoon salt
1/2 teaspoon black pepper
1/4 cup extra-virgin olive oil
3 scallions, thinly sliced, reserving sliced greens separately
2 tablespoons Sherry vinegar
1 tablespoon water

Steps:

Put oven rack in upper third of oven and preheat oven to 450°F.
Peel sweet potatoes, then cut each lengthwise into 6 spears. Cut spears in half crosswise if desired, then arrange in 1 layer in a large (17- by 12-inch) shallow baking pan.
Cook bacon in a 10-inch heavy skillet over moderate heat, stirring, until browned and crisp, 10 to 15 minutes. Transfer with a slotted spoon to paper towels to drain, then pour bacon fat through a fine-mesh sieve onto potato spears and toss with 2 spatulas to coat. Sprinkle spears with 1/2 teaspoon salt and 1/4 teaspoon pepper and roast (uncovered), turning every 15 to 20 minutes, until potatoes are tender and edges are browned, 45 minutes to 1 hour. Transfer to a serving dish.
Return bacon to cleaned skillet, then add oil and heat over moderate heat until hot but not smoking. Stir in white part of scallions and remove from heat. Stir in vinegar, water, remaining 1/2 teaspoon salt, and remaining 1/4 teaspoon pepper and pour over potato spears. Sprinkle potatoes with scallion greens and serve warm.