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Double boiler

A double boiler is a stovetop apparatus used to cook delicate sauces such as beurre blanc to melt chocolate without burning, or for any occasion when more indirect heating is desired.

It consists of a saucepot of boiling water, on top of which a second pot fits, so that the latter is heated by steam.

If one does not own such a device, the same cooking technique can be achieved by placing a metal bowl or glass bottle in a larger pot of boiling water.

A similar device is the bain-marie.

Compare to Double steaming.