Wassailing is a very ancient custom that is rarely done today. The word wassail comes from the Anglo-Saxon phrase waes hael, which means good health. Originally, the wassail was a drink made of mulled ale, curdled cream, roasted apples, eggs, cloves, ginger, nutmeg and sugar. It was served from huge bowls, often made of silver or pewter.
One legend about how Wassailing was created, says that a beautiful Saxon maiden named Rowena presented Prince Vortigen with a bowl of wine while toasting him with the words Waes hael. Over the centuries, a great deal of ceremony developed around the custom of drinking wassail. The bowl was carried into a room with a great fanfare, a traditional carol about the drink was sung, and finally, the steaming hot beverage was served.
From this it developed into a another way of saying Merry Christmas to each other!