Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Trim the woody ends off the asparagus spears and place them on the prepared baking sheet.
Mince the garlic clove and toss the asparagus with half of the olive oil, the minced garlic, and half of the sea salt and black pepper.
Roast the asparagus in the oven for 10 to 12 minutes until they are tender and slightly charred at the tips.
While the asparagus is roasting, pat the salmon fillet dry with a paper towel and season both sides with the remaining salt, pepper, and dried oregano.
Heat the remaining half tablespoon of olive oil in a stainless steel or cast-iron skillet over medium-high heat until shimmering.
Place the salmon fillet skin-side down in the pan and sear for 4 to 5 minutes without moving it to ensure the skin becomes perfectly crispy.
Carefully flip the salmon and cook for an additional 2 to 3 minutes until the internal temperature reaches 145°F.
Remove from heat and serve the salmon immediately alongside the roasted asparagus, finishing the entire plate with a fresh drizzle of lemon juice.