It is commonly used for cooking delicate foods such as custards. The purpose of a bain-marie is that it creates a gentle heat around the food and results in a uniform cooking process. ... In every case, the process involves using a container of hot water to deliver indirect heat, or steam, or both to the food.

What is the purpose of a bain-marie?

In essence, it is a heated bath that can be used both to cook food and to keep food warm over time. The term itself has become more loosely used to describe the type of pan used. So while its origins are focused on cooking and heating, modern bain maries are also commonly used to hold cold food items as well.

How long can food be left in a bain-marie?

Food kept at a consistent temperature, either hot or cold, can be kept safely in a bain-marie for up to 4 hours.