Blend cream cheese, onion, horseradish and Worchestershire sauce until of spreading consistency. Seperate meat slices. Lay our five slices, slightly overlapping on an 18" piece of aluninum foil. Lay out two more rows to form a rectangle of meat. Spread with cheese mixture. Roll up as jelly roll using foil to bring up meat at begining of roll. Use fingers to roll until complete. Chill until very firm. Just before serving, slice into one inch slices.