Preheat your oven to 400°F and line a baking sheet with parchment paper.
Trim the woody ends off the asparagus and toss them with half of the avocado oil, salt, and pepper on the baking sheet.
Roast the asparagus for 12 to 15 minutes until tender and slightly charred.
While the asparagus roasts, steam the cauliflower florets until they are very soft, about 8 to 10 minutes.
Place the steamed cauliflower in a blender or food processor with the garlic and a pinch of salt, then blend until completely smooth and creamy.
Pat the salmon fillet 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 in the pan skin-side down and sear for 4 to 5 minutes until the skin is crispy.
Flip the salmon and cook for another 3 to 4 minutes until the internal temperature reaches 145°F.
Spoon the cauliflower mash onto a plate, top with the seared salmon, and serve with the roasted asparagus and a fresh lemon wedge.