Preheat Oven (if baking):
Preheat to 400°F (200°C) and line a baking sheet with parchment paper or foil.
Make the Glaze:
In a small bowl, whisk together soy sauce, honey, brown sugar, mustard, garlic, vinegar (or lemon juice), and pepper.
Sear or Bake:
For Baking:
Place salmon on the prepared baking sheet.
Brush glaze generously over each piece.
Bake for 12–15 minutes, basting once halfway through, until the salmon is flaky and cooked through.
Broil for the last 1–2 minutes to caramelize the glaze.
For Stovetop:
Heat olive oil in a skillet over medium heat.
Sear salmon skin-side down first for 3–4 minutes. Flip, pour in glaze, and cook for another 3–4 minutes, spooning glaze over the top until thickened and the salmon is fully cooked.
Serve:
Garnish with sesame seeds or green onions and serve with rice, quinoa, or roasted vegetables.