Rinse the dry quinoa under cold water and combine with 0.25 cup of water in a small saucepan.
Bring quinoa to a boil, then reduce heat to low, cover, and simmer for 10-12 minutes until water is absorbed and quinoa is fluffy.
In a small bowl, combine the chopped fresh dill, parsley, lemon zest, and Dijon mustard to create a thick herb paste.
Pat the salmon fillet dry with a paper towel and season both sides with sea salt and black pepper.
Spread the herb paste evenly over the top of the salmon fillet.
Heat the extra virgin olive oil in a non-stick skillet over medium-high heat.
Place the salmon in the skillet and cook for 4-5 minutes per side until the crust is golden and the fish flakes easily.
In the same skillet, quickly sauté the fresh spinach for 1 minute until just wilted.
Toss the cooked quinoa with lemon juice and any remaining fresh herbs.
Plate the lemon-dill quinoa and spinach, topping with the herb-crusted salmon fillet.