In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the salmon fillet in a shallow dish and pour half of the marinade over it, ensuring it is well coated.
Toss the asparagus spears with the remaining marinade in a separate bowl.
Preheat a grill or grill pan over medium-high heat.
Place the salmon on the grill skin-side down and cook for 4-5 minutes, then flip and cook for another 3-4 minutes until flaky.
Add the asparagus to the grill alongside the salmon and cook for 5-6 minutes, turning occasionally until tender and lightly charred.
In a small skillet, sauté the cauliflower rice over medium heat for 3-5 minutes until softened.
Plate the salmon and asparagus over the cauliflower rice and garnish with fresh chopped parsley.