Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Toss the cubed sweet potatoes with half of the 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, add the asparagus spears, drizzle with the remaining oil, and return to the oven for another 10 minutes until the vegetables are tender.
While the vegetables roast, pat the salmon fillet dry with a paper towel and season with salt and pepper.
Heat a non-stick skillet over medium-high heat and place the salmon skin-side down in the pan.
Press down lightly with a spatula and sear for 4 to 5 minutes until the skin is golden and crisp.
Flip the salmon carefully and cook for an additional 2 to 3 minutes until it reaches your desired level of doneness.
Plate the salmon alongside the roasted sweet potatoes and asparagus, finishing with a fresh squeeze of lemon juice.