01 - Preheat oven to 400°F. Line a large sheet pan with parchment paper or lightly grease it.
02 - In a small bowl, whisk together olive oil, lemon juice, lemon zest, minced garlic, parsley, dill, salt, and pepper until well combined.
03 - Arrange asparagus in a single layer on one side of the prepared sheet pan. Drizzle with 1 tablespoon of the marinade and toss to coat evenly.
04 - Pat salmon fillets dry with paper towels. Place them skin-side down next to the asparagus on the sheet pan. Spoon remaining marinade evenly over the salmon.
05 - Add lemon slices on top of the salmon and asparagus if desired for additional flavor and presentation.
06 - Roast in the preheated oven for 15–18 minutes, or until salmon is cooked through and flakes easily with a fork, and asparagus is tender-crisp.
07 - Remove from oven and serve immediately, garnished with extra fresh herbs and additional lemon wedges.