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In a medium bowl, season the beef with a little salt and pepper; mix in the grated onion, Worcestershire sauce and horseradish. Form the beef into 4 large, thin patties to fit the size and shape of the bread.
In a medium skillet, heat 2 tablespoons of the oil, two turns of the pan, over medium heat. Add the sliced onion and cook, stirring occasionally, until golden brown, 12-15 minutes. Transfer the onions to a plate. Wipe out the skillet and add the sauerkraut. Reduce the heat to low and stir until the sauerkraut is warm, about 2 minutes.