Instructions

  1. Butter a 2- to 2 1/2-quart shallow ceramic flameproof baking dish.
  2. Cook asparagus in a 5- to 6-quart pot of boiling salted water, uncovered, until crisp-tender, about 4 minutes.
  3. Drain in a colander, then transfer to baking dish and keep warm, tightly covered with foil.
  4. Meanwhile, heat oil and butter in a 12-inch heavy skillet over high heat until foam subsides, then cook shallots, stirring occasionally, until pale golden, about 3 minutes.
  5. Add bread and pine nuts and cook, stirring, until browned in spots, about 5 minutes. Transfer to a bowl and add pepper, 1/2 cup Parmigiano-Reggiano, and 1/4 teaspoon salt, tossing to combine.
  6. Preheat broiler.
  7. Toss warm asparagus with mascarpone, remaining 1/2 cup Parmigiano-Reggiano, and remaining 1/4 teaspoon salt until combined well.
  8. Sprinkle bread-crumb mixture evenly over asparagus. Broil 5 to 7 inches from heat until topping is golden brown, 1 to 2 minutes.