Preheat your oven to 425°F.
Toss the asparagus lightly with half of the olive oil, salt, and pepper, then spread on a baking sheet.
Roast the asparagus in the oven for 12-15 minutes until tender and slightly crisp.
Meanwhile, prepare the cauliflower mash by steaming the cauliflower florets until soft (about 8-10 minutes).
In a blender or using a fork, blend or mash the steamed cauliflower with a pinch of salt, pepper, garlic, and a drizzle of olive oil until smooth and creamy.
Season the salmon fillet with salt, pepper, and a squeeze of lemon juice.
Heat a non-stick skillet over medium-high heat. Add a dash of olive oil and sear the salmon skin-side down for 3-4 minutes until crispy, then flip and cook for an additional 3-4 minutes until just cooked through.
Assemble the plate with a serving of cauliflower mash, arrange the roasted asparagus alongside, and place the seared salmon on top.
Garnish with an extra drizzle of lemon juice if desired, and serve immediately.