What is a bain-marie used for?

Answer It is placed in the oven when baking to create moist heat.

A bain-marie is a French baking method that works by placing a pan containing the food you are baking in the center of a larger pan on the rack in the oven. Boiling water is then poured into the outer pan and the oven door is closed. The combination of heat and light steam creates a moist, even heat for custards and other delicate desserts and prevents a skin from forming on the top.

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