Arrange the salmon fillets in a 9x13 inch baking dish.
In a small bowl, whisk together the butter, maple syrup, mustard and soy sauce. Pour over salmon. Add some freshly ground pepper, if preferred.
Bake for 15 to 20 minutes or until salmon flakes with a fork.
This sauce would also work great on other types of fish as a red snapper or cod.Salmon doesn't have a very long shelf life, so be sure to eat it quickly. In the fridge it will keep for up to 2 days stored in an airtight container. In the freezer this dish will last from 3 - 4 months in an airtight container. Allow to thaw in its container overnight in the fridge or in cold water. The glaze will keep for up to 4 weeks stored in its own airtight container in the fridge.Nutrition: Please keep in mind that nutritional information is a rough estimate and can vary greatly based on products used.