This is quite an elegant entree, easy enough for any night, but could easily be served to guests. From Bon Appetit.
Preheat oven to 350 degrees F.
Whisk mustard, 3 TBS maple syrup, 3 1/2 TBS water, and horseradish in small bowl to blend.
Arrange salmon on baking sheet.
Whisk 1 1/2 TBS maple syrup, sugar and thyme in another small bowl to blend.
Spread thyme mixture evenly over salmon.
Bake until salmon is just opaque in center, about 14 minutes.
Transfer salmon to plates.
Spoon mustard-horseradish sauce over and serve.