Place a rack 5 inches below the broiler element and preheat the broiler. Line a baking sheet with foil (if desired) then oil the foil or tray.
Prepare the maple glaze by putting the maple syrup, soy sauce, garlic, ginger, and cayenne into a small pot then whisk together.
Bring to a simmer over medium heat for about 5 minutes until it starts to thicken into a syrup.
Remove from heat and set aside.
Prepare the salmon and bok choy by putting the salmon on the oiled tray and seasoning with the salt and pepper.
Drizzle the bok choy with the oil. Brush over each half.
Place the prepared salmon and bok choy in the oven under the broiler for 5 minutes.
Brush the salmon with some glaze and return to the broiler for another 2 or 3 minutes. You can choose to remove the bok choy, or continue to cook it alongside the fish, depending on your preference.
Remove the tray from the broiler when the fish and bok choy are ready.
Glaze the salmon with more sauce before serving.
Place one piece of fish on each of two plates, add two pieces of bok choy and serve with brown rice or risotto.