Process: Bain Marie
A bain marie is a water bath made by putting a pan or bowl of food over a pan of hot water which should be kept at just below boiling point. It is used to melt food or to keep delicate sauces and soups hot without further cooking, or for foods which spoil if cooked over a direct heat source. Here the cook demonstrates using a bain marie to melt chocolate.
Further pictures - Bain Marie