The combination of pickled beets and horseradish is common in eastern Europe, and its popularity has been co-opted by German cooks, who have long used both elements in the kitchen.
Zakuski is a spread of Russian appetizers, little dishes that, rather like Mediterranean mezze, can either start a meal or constitute the entire thing.
An improvised recipe for our Stump the Cook contest that is eaten at room temperature. For appetizers and snacks, pile the onions on garlic toast or cucumber slices. For main dishes, try it over grilled salmon, sword fish, or lamb, or over cous cous, quinoa, or rice.