Simple Roast Salmon with Potatoes, Asparagus, and Lemon-Dill-Caper Drizzle

Serves 6 1 whole side salmon (2 1/2 to 3 pounds) 5 tablespoons pure olive oil, divided, and 6 tablespoons extra-virgin olive oil Salt and ground black pepper 2 pounds fingerling potatoes or new red potatoes, halved 2 bunches (2 pounds) asparagus, tough ends snapped off 1/4 cup each parsley and dill leaves, chopped coarse, plus extra sprigs for...