Broiled: Preheat a broiler to high. Add the asparagus stalks to a foil-lined baking sheet. Drizzle them with olive oil, and add the kosher salt and a few grinds of black pepper. Thinly slice 4 lemon wheels from the lemon, then add them right on the baking sheet. Broil 3 minutes. Remove the tray and stir. Then broil 2 to 3 minutes more, until the spears are tender when pierced by a fork at the thickest part. Sprinkle with grated Parmesan cheese (optional) and serve.
Roasted: Preheat the oven to 425 degrees Fahrenheit. Add the whole asparagus stalks to a foil-lined baking sheet. Drizzle them with 1 tablespoon olive oil, and add 1/2 teaspoon kosher salt and a few grinds of black pepper. Add the zest of 1/2 lemon and mix with your hands. Thinly slice 4 lemon wheels from the lemon, then add them right on the tray. Sprinkle everything with Parmesan cheese (optional). Bake 10 to 15 minutes, until tender when pierced by a fork at the thickest part. The timing will depend on the thickness of the asparagus spears.
Sautéed: Cut the stalks into bite-sized pieces. In large skillet, heat 1 tablespoon olive oil over medium high heat. Add the asparagus, 1/2 teaspoon kosher salt, and fresh ground pepper. Cook, stirring occasionally, until the largest pieces are tender, about 5 to 8 minutes. Taste and remove when it’s just tender and still bright green, but not crunchy. When the asparagus is done, remove from heat and stir in 1 teaspoon lemon juice plus the zest of 1/2 lemon. Add optional Parmesan if desired.
Grilled: Preheat a grill to medium-high heat (375 to 450 degrees). In a bowl, mix the asparagus with 1 tablespoon olive oil, 1/2 teaspoon kosher salt, and plenty of fresh ground black pepper. Place the asparagus directly on the grill grates and grill for about 3 to 4 minutes until charred and tender, turning once. Remove from the grill and spritz with lemon juice from wedges from 1/2 of the lemon.