A double boiler is a stove top apparatus used to cook delicate sauces such as beurre blanc or to melt chocolate without burning or seizing. It consists of an upper vessel containing the substance to be cooked which is situated above a lower pot of water. When brought to a boil, the steam released in the lower pot provides heat against the bottom of the upper one. The upper vessel must fit over tightly, or else steam may escape and affect the cooking substance .
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