Roasted Asparagus with Caper Dressing

2 bunches asparagus (about 2 pounds)
1 tablespoon plus 2 teaspoons extra-virgin olive oil, divided
1/4 teaspoon salt
1/2 teaspoon freshly ground pepper, divided
1/3 cup chopped shallot
1/4 cup flat-leaf parsley leaves
3 tablespoons capers, rinsed
2 tablespoon white-wine vinegar

Directions
Preheat oven to 450 degree F.
Trim tough ends from asparagus; place on a baking sheet. Drizzle the asparagus with 1 tablespoon oil, salt and 1/4 teaspoon pepper; toss to coat. Spread in a single layer and roast, turning once halfway through, until the asparagus begins to soften and brown, 12 to 14 minutes. Transfer to a serving platter.

Meanwhile, place shallot, parsley and capers on a cutting board and chop together to make a coarse mixture. Transfer to a small bowl and combine with vinegar, the remaining 2 teaspoons oil and 1/4 teaspoon pepper. Serve the asparagus topped with the dressing.