Preheat oven to 375°F.
Grate potatoes through the large holes of a box grater into a medium sized bowl.
Stir in horseradish, oil and salt and pepper mixing well.
Pat crust onto top surface of filets and place in a baking pan or on a baking sheet.
Bake until salmon is cooked through and the crust is golden and crispy, about 15 minutes.
The Pickle Sauce:
Place all ingredients into a bowl and mix well.
Serve with salmon
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