01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease a baking dish to prevent sticking.
02 - Gently pat the salmon fillets dry with paper towels. Brush both sides of each fillet with olive oil, then season evenly with sea salt and freshly ground black pepper. Place the seasoned fillets, skin-side down if applicable, onto the prepared baking sheet.
03 - In a small saucepan, combine the blood orange juice, zest, honey, soy sauce, Dijon mustard, minced garlic, and crushed red pepper flakes (if using). Bring the mixture to a gentle simmer over medium heat. Continue to cook, stirring occasionally, until the glaze has reduced by approximately half and achieved a slightly syrupy consistency, typically 7 to 10 minutes. Remove from heat.
04 - Spoon half of the prepared blood orange glaze evenly over the top of the salmon fillets.
05 - Transfer the baking sheet to the preheated oven. Bake the salmon for 12 to 15 minutes, or until it is cooked through and flakes easily with a fork.
06 - Carefully remove the salmon from the oven. Brush the baked fillets with the remaining blood orange glaze.
07 - Garnish each salmon fillet with finely chopped fresh parsley and, if desired, a few thin slices of fresh blood orange. Serve immediately for optimal flavor.