Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Peel the sweet potato and cut into small 1/2-inch cubes to ensure even roasting.
Toss the sweet potato cubes with half of the avocado oil and a pinch of sea salt on the prepared baking sheet.
Roast the sweet potatoes for 15 minutes.
While potatoes roast, trim the woody ends off the asparagus spears.
Add the asparagus to the baking sheet with the sweet potatoes, tossing lightly to coat with the residual oil, and roast for an additional 10 minutes.
Season the salmon fillet with sea salt and black pepper on both sides.
Heat the remaining avocado oil in a non-stick skillet over medium-high heat.
Place the salmon in the hot pan, skin-side down, and sear for 4-5 minutes until the skin is crispy and golden.
Carefully flip the salmon and cook for another 2-3 minutes until the fish is opaque and flakes easily with a fork.
Plate the seared salmon alongside the roasted sweet potatoes and asparagus.
Drizzle the entire dish with fresh lemon juice before serving.