Peel and thinly slice the beets with a cheese slicer. Combine the olive oil, lemon juice, and seasoning, and pour it over the sliced beets. Marinate them for 1 hour.
Cut three-quarters of the horseradish into matchsticks, and toss it in the cornstarch. Deep-fry the horseradish sticks in oil until golden brown and salt them lightly.
Grill the fish, skin side down. Heat some of th