Stage 1: Ready the Salmon : Remove the salmon from its packaging and pat thoroughly dry with paper towels; this is key for a great sear. Season both sides of the fillets generously with the sea salt and crushed red pepper flakes. Let them rest at room temperature while you prepare the glaze.
Stage 2: Prepare the Glaze : In the small saucepan, whisk together the balsamic vinegar, fresh lemon juice, and honey. Add the minced garlic and ginger directly into the liquids.
Stage 3: Simmer & Infuse : Bring the glaze mixture to a gentle simmer over medium heat. Allow it to bubble for 3–4 minutes, stirring occasionally, until it has slightly reduced and the aromas of garlic and ginger are fragrant.
Stage 4: Thicken the Glaze : In a small bowl, create a slurry by whisking the cornstarch and water until no lumps remain. Slowly pour the slurry into the simmering glaze, whisking constantly. Continue to cook for another 45 seconds as the glaze visibly thickens to a syrupy consistency. Remove from heat.
Stage 5: Sear the Fillets : Heat the olive oil in the cast-iron pan over medium-high heat. Once the oil shimmers, carefully place the salmon fillets in the pan, leaving space between them. Sear for 3–4 minutes without moving them to form a golden crust.
Stage 6: Glaze & Finish Cooking : Flip the salmon fillets over. Immediately pour the prepared balsamic glaze over all the fillets. Let the sauce bubble and thicken around the fish for another 3–5 minutes, or until the salmon is cooked through and reaches an internal temperature of 140°F (60°C). The fish should flake easily with a fork. Serve immediately, garnished with toasted pine nuts and fresh parsley.