Preheat your grill to 400°F and gather your tools: heavy-duty aluminum foil, parchment paper, and tongs.

Rinse the asparagus under cold water and trim the woody ends, ensuring all stalks are uniform.

Lay a large sheet of aluminum foil on a flat surface and place a smaller piece of parchment paper on top.

Arrange the asparagus on the parchment, drizzle with olive oil, and sprinkle with sea salt and garlic powder. Toss gently to coat.

Cover with another layer of parchment and seal the foil tightly to trap heat and steam.

Place the sealed packet on the grill and cook for 6-8 minutes, flip, and cook for another 6-8 minutes.

Remove the packet from the grill, open carefully, and optionally top with lemon zest and parmesan before serving.