Place your salmon fillet in a shallow glass baking dish, skin-side down. Sprinkle the minced garlic, ground ginger, and black pepper evenly over the top.
In a small bowl, whisk together the maple syrup and soy sauce until well combined. Pour over the salmon, ensuring it's well coated.
Marinate the salmon for 30 minutes at room temperature. Halfway through, gently flip the salmon so the skin side is also soaking up some glaze. You can let it marinate in the refrigerator overnight.
When you're ready to cook, preheat your oven's broiler. Flip the salmon back so it's skin-side down again and spoon some of the marinade from the dish over the top.
Broil the salmon about 6 inches from the heat source for 15 to 20 minutes. Keep an eye on it and spoon more glaze over the top.
Once the salmon is cooked (you're looking for a golden top and a flaky texture), let it rest for a couple of minutes. Then, cut it into four equal portions. Make sure to drizzle the remaining glaze from the baking dish over each piece.