Bearnaise Reduction

Behind every great béarnaise sauce is this little pot of concentrated flavor. The reduction is the unsung foundation that gives béarnaise, and its tomato-spiked cousin choron, that signature herbal, tangy backbone before any butter or egg yolk enters the picture.

The technique is classic French groundwork. Sweat the shallots gently to soften them and mellow their sharpness, then combine them with tarragon, peppercorns, wine, and vinegar and simmer the lot down. Reducing by half is the whole point: it cooks off the raw alcohol and harsh vinegar edge while concentrating the aromatics into an intense, fragrant essence.

Tarragon is the defining note here, that gentle anise-like, sweet-grassy herb that makes béarnaise unmistakable. Strain the finished reduction and you hold the flavor key that turns plain whisked butter and yolks into a restaurant-worthy sauce.

Chef Tips

• Sweat the shallots slowly without browning. You want them soft and sweet, not caramelized.
• Reduce until syrupy and concentrated. Under-reducing leaves the finished sauce thin and sharp.
• Strain out the solids before building your sauce for a smooth, refined result.

Variations

• Use the tarragon stems in the reduction and save the leaves to fold into the finished sauce.
• Add a splash more vinegar for a sharper, brighter base.
• Stir in tomato paste or concentrate to take the finished béarnaise toward choron sauce.