Prepare the brown rice according to package instructions and keep warm.
Pat the salmon fillet dry with a paper towel and season both sides with sea salt and black pepper.
Heat avocado oil in a large stainless steel or cast iron skillet over medium-high heat.
Place the salmon in the pan skin-side down and sear for 4 to 5 minutes until the skin is golden and crisp.
Carefully flip the salmon and cook for an additional 3 minutes or until it reaches your preferred level of doneness, then remove from the pan and set aside.
Reduce the heat to medium and add the grass-fed butter to the same skillet.
Add the minced garlic and sauté for about 60 seconds until fragrant but not browned.
Add the fresh spinach to the skillet in handfuls, tossing until completely wilted.
Pour in the heavy cream and simmer for 1 to 2 minutes until the sauce thickens slightly and coats the spinach.
Plate the brown rice, top with the creamy garlic spinach, and place the seared salmon on top, finishing with a fresh squeeze of lemon juice.