Preheat the oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Finely mince the first portion of fresh parsley and combine it in a small bowl with the almond flour, lemon zest, and half of the salt and pepper.
Pat the salmon fillet dry with a paper towel and press the parsley mixture firmly onto the top of the fish to create an even crust.
Place the salmon and the asparagus spears onto the prepared baking sheet in a single layer.
Roast for 12 to 15 minutes or until the salmon is cooked through and the herb crust is slightly golden.
While the salmon cooks, combine the remaining parsley, olive oil, lemon juice, garlic, and remaining salt and pepper in a blender.
Process the sauce until it is completely smooth and reaches a vibrant green color.
Plate the roasted salmon alongside the tender asparagus and drizzle the fresh parsley sauce over the top before serving.