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In a blender or food processor, combine the grated beets, rock salt, powdered sugar, horseradish, coriander, white pepper, and dried herbs. Process for 30–60 seconds until the mixture forms a thick, spreadable paste.
Line a shallow dish or container with plastic wrap, making sure there’s plenty of overhang. Spread half of the beet mixture evenly on the bottom.
Rinse the salmon fillet under cold water and pat completely dry with paper towels. Place the salmon, skin-side up, on the beet mixture, pressing it down gently for even coverage.
Spread the remaining beet mixture over the top of the salmon. Wrap the plastic wrap tightly around the fish, sealing it completely.
Place in the refrigerator and weigh it down with a small plate or can to help the cure penetrate evenly.
Let the salmon cure for 48 hours, flipping it over once at the 24-hour mark.
After 48 hours, remove the salmon from the wrap and scrape off as much of the beet mixture as possible.
Rinse the fillet thoroughly under cold water and pat dry with paper towels.
Using a sharp knife, thinly slice the salmon at an angle. Serve with matzo, crackers, fresh herbs, or a touch of horseradish.