Roasted Sweet-Potato Spears with Bacon Vinaigrette

Ingredients

• ¼ cup extra-virgin olive oil
• 3 scallions
• 2 tablespoons Sherry vinegar
• ½ pound sliced bacon
• 1 tablespoon water
• 4 pounds medium sweet potatoes
• 1 teaspoon salt
• + 1 more ingredients
• • ½ teaspoon black pepper

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, s...

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