Preheat the Oven: Preheat your oven to 200°C and line a baking tray with non-stick baking paper.
Prepare the Potatoes: Slice the potatoes in half lengthways and place them on the tray. Pat the salmon dry with a paper towel.
Arrange and Season: Place the salmon in the middle of the tray. Drizzle the salmon and potatoes with 2 tablespoons of olive oil, and season with sea salt and pepper. Bake for about 18-20 minutes, or until the potatoes are tender and the salmon starts to turn golden at the edges.
Add Asparagus: After 20 minutes, spread the trimmed asparagus onto the tray. Drizzle with the remaining 2 tablespoons of olive oil and season with salt and pepper.
Increase Temperature and Bake: Turn the oven up to 250°C. Return the tray to the oven and bake for an additional 10 minutes, or until the salmon is cooked through, the potatoes are golden brown, and the asparagus is slightly charred and tender.
Prepare the Sauce: While the salmon is baking, melt the butter and honey together in a small pan over medium heat. Add the chopped garlic and cook until fragrant. Stir in the juice of half a lemon and the chopped parsley.
Finish and Serve: Once the salmon is cooked, remove it from the oven and drizzle with the hot honey garlic sauce. Top the salmon with lemon slices and serve immediately.