Steam the cauliflower florets in a steamer basket over boiling water for 10-12 minutes until they are very fork-tender.
During the last 4 minutes of cauliflower steaming, add the asparagus spears to the steamer basket and cook until they are tender-crisp and vibrant green.
Transfer the steamed cauliflower to a food processor or blender along with the Greek yogurt, minced garlic, and a pinch of sea salt.
Pulse the cauliflower mixture until it reaches a smooth, creamy consistency, then set aside and keep warm.
Heat the ghee in a heavy-bottomed skillet over medium-high heat until shimmering.
Pat the salmon fillet dry with paper towels, season both sides with salt and pepper, and place it in the skillet skin-side down.
Sear the salmon for 4-5 minutes without moving it to ensure the skin becomes crispy, then flip and cook for an additional 2-3 minutes until cooked to your preference.
Spoon the cauliflower mash onto a plate, top with the seared salmon, and serve with the steamed asparagus and a fresh squeeze of lemon juice.