Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Toss the cubed sweet potatoes with 0.5 teaspoon of avocado oil and a pinch of sea salt, then spread them in a single layer on the baking sheet.
Roast the sweet potatoes for 15 minutes.
Remove the tray from the oven, add the asparagus spears, and drizzle them with another 0.5 teaspoon of avocado oil.
Return the tray to the oven and roast for an additional 10 to 12 minutes until the vegetables are tender and slightly caramelized.
While the vegetables finish roasting, pat the salmon fillet completely dry with a paper towel and season with salt and black pepper.
Heat the remaining 0.5 teaspoon of avocado oil in a non-stick skillet over medium-high heat.
Place the salmon in the pan, skin-side up, and sear for 4 minutes until a golden crust forms.
Flip the salmon carefully and cook for another 3 to 4 minutes until the internal temperature reaches 145°F.
Plate the salmon alongside the roasted sweet potatoes and asparagus, then drizzle the entire dish with fresh lemon juice before serving.