Preheat oven to 350 degrees Fahrenheit. Line a baking sheet with Gefen Parchment Paper; set aside.

Mix the horseradish and mayonnaise together in a small bowl.

Place the salmon on prepared baking sheet; spread with horseradish mixture. Set aside.

In a food processor fitted with the “S” blade, crush the nuts until they are coarsely ground but not too fine. Add the brown sugar and lemon juice; pulse until the mixture looks like wet sand.

Pat nut mixture onto salmon, covering the entire surface.

Bake for 25 minutes, until the center flakes when pierced with a fork.