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Beurre blanc is a classic French sauce made by emulsifying cold butter into a reduction of white wine, vinegar, and shallots, creating a rich, velvety texture. It originates from the Loire Valley and is traditionally served with fish or seafood.
This sauce is very high in fat due to its butter base, providing a significant amount of saturated fat and calories—roughly 100-150 calories per tablespoon. It offers minimal protein or carbohydrates, with some vitamins like vitamin A from the butter.
Culturally, beurre blanc is considered a foundational 'mother sauce' in French cuisine, showcasing the art of emulsification. Nutritionally, it's a prime example of a high-energy, flavor-dense condiment where a small amount dramatically enriches a dish.