Walnut (slice) cake with egg yolk glaze (Slovak: orechový koláàso à ¾Ãºtkovou polevou, (orechovo-) à ¾Ãºtkové rezy, jarné (orechové) rezy, à ¾ltý koláÃÂ, zlatý koláÃÂ; Czech: à ¾loutkové à Âezy (s oà Âechy)) is a simple Czech and Slovak festive cake made from walnut or coffee-flavored sponge cake and egg yolk glaze. In Slovakia and the Czech Republic, it is traditionally served at Christmas and Easter parties. It is sometimes served with coffee.