Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and chop the sweet potato into small cubes, then boil in a pot of water for 10-12 minutes until soft.
Trim the woody ends off the asparagus, toss with half the avocado oil, salt, and pepper, and roast for 10 minutes until tender.
Pat the salmon fillet completely dry with a paper towel and season both sides with salt and pepper.
Heat the remaining avocado oil in a non-stick skillet over medium-high heat.
Place the salmon skin-side up in the pan and sear for 4-5 minutes until a golden crust forms, then flip and cook for 3-4 more minutes.
Drain the sweet potatoes and mash them thoroughly, adding a pinch of salt and a tablespoon of hot water if needed for creaminess.
Serve the seared salmon over the sweet potato mash with the roasted asparagus on the side, topped with a fresh squeeze of lemon juice.