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["Preheat oven to 400u00b0F. Wrap beets individually in foil, place on a rimmed baking sheet, and roast until tender, 50-60 minutes. Let cool. Peel and cut into 1/4"" cubes.", "Whisk lemon juice, horseradish, and vinegar in a medium bowl; gradually add oil, whisking to blend well. Season with salt. DO AHEAD:", "Heat oven to 400u00b0F. Place cod on a rimmed baking sheet. Rub with 1 tablespoon oil. Roast until just opaque in center, 10-15 minutes. Let fish cool, then flake with a fork.", "Mix cod, whitefish, eggs, shallot, matzo, chives, 2 tablespoons dill, and 2 tablespoons water in a medium bowl. Season with pepper and mix vigorously to combine (mixture will be stiff). DO AHEAD:", "Reduce oven temperature to 200u00b0F; set a wire rack inside a large rimmed baking sheet. Heat remaining 4 tablespoons oil in a large skillet over medium-high heat. Working in batches, drop scant 1/4-cupfuls of fritter mixture into skillet; press gently with a spatula to flatten. Cook, turning once and adding more oil if needed, until golden brown and crispy around edges, about 4 minutes per batch. Transfer to prepared rack. Keep warm in oven while cooking remaining fritters.", "Mix beets into vinaigrette. Serve fritters with vinaigrette; top with dill."]
