Start by combining the soy sauce, honey, rice vinegar, grated ginger, minced garlic, and sesame oil in a small bowl. Whisk it well until the honey dissolves completely. This mixture will be your flavorful glaze that brings everything together. You can also use coconut aminos if you're following a Paleo diet for a milder, slightly sweeter version.
Heat olive oil in a large skillet over medium heat. While the oil is heating, season the cod fillets lightly with salt and pepper. Carefully place the fillets in the skillet. Let them sear for 3–4 minutes on each side until they turn golden brown and are cooked through. Remove the cod gently and set it aside on a plate.
In the same skillet, pour in your prepared glaze. Let it simmer for a few minutes until it starts to reduce slightly. If you prefer a thicker glaze, mix the cornstarch with a splash of water and stir it into the sauce. Once the glaze starts to thicken, return the cod fillets to the pan and spoon the glaze over the top until they’re nicely coated.
Transfer the glazed cod to a serving plate. Drizzle extra glaze over the top for more flavor. Garnish with sesame seeds and chopped green onions for freshness and crunch. This dish pairs beautifully with a bowl of steamed rice and some roasted or sautéed vegetables for a complete and balanced meal.