1. Rinse asparagus; snap off tough stem ends and discard. Spread asparagus in a 10- by 15-inch baking pan. Drizzle with plain olive oil, then shake pan lightly to coat asparagus. Sprinkle lightly with salt and pepper.
2. Bake in a 400° oven until asparagus is tender-crisp to bite, 9 to 10 minutes.
3. Transfer to a platter. Sprinkle with lemon peel; drizzle with lemon-flavored oil. Serve warm or at room temperature.