Start by preheating your oven to 200°C (400°F) so it reaches the right temperature before you put anything inside. While the oven is heating, take a baking tray and lay out large pieces of aluminum foil on it—make sure each piece is big enough to fully wrap a salmon fillet along with the asparagus. This setup will help cook everything evenly and keep the juices sealed inside.

Wash the asparagus thoroughly under running water, then trim off the tough woody ends (usually about 1–2 inches from the bottom). Pat them dry with a towel so they roast properly instead of steaming too much. Place the asparagus evenly in the center of each foil sheet, spreading them out slightly so they form a base layer for the salmon.

Gently place each salmon fillet on top of the asparagus. Try to position the fillets in the center so the heat circulates evenly around them while baking. If your fillets have skin, you can place them skin-side down for better structure and easier serving later.

In a small bowl, mix the melted butter, minced garlic, and fresh lemon juice until well combined. Slowly drizzle this mixture evenly over each salmon fillet, making sure some of it also coats the asparagus underneath. This step is key because it infuses both the fish and vegetables with flavor as they cook.

Sprinkle salt and black pepper evenly over the salmon and asparagus. Don’t rush this step—seasoning properly ensures every bite tastes balanced. If you like, you can lightly rub the seasoning into the salmon so it adheres better.

Carefully fold the foil over the salmon and asparagus to create sealed packets. Start by bringing the longer sides together and folding them down, then fold in the shorter ends tightly. Make sure there are no gaps or openings—this seal traps steam inside, which keeps the salmon tender and juicy.

Place the tray in the oven and bake for 12–15 minutes. Keep an eye on the timing—salmon cooks quickly, and overcooking can dry it out. You’ll know it’s ready when the fish flakes easily with a fork and looks opaque in the center.

Once done, remove the tray from the oven and let it sit for a minute. Carefully open the foil packets, keeping your face and hands away as hot steam will escape. Serve immediately while everything is warm, juicy, and full of flavor.