Classic béarnaise is already a labor of love, and this version layers in the subtle sweetness of fennel and the anise-forward brightness of fresh tarragon for something that feels genuinely special. The reduction builds a fragrant, complex base from white grape juice, water, tarragon stems, and finely chopped fennel — all strained smooth before the egg yolks ever hit the bowl. From there, it's a careful double-boiler process that coaxes the yolks into a silky, stable emulsion before the butter goes in one tablespoon at a time. That slow, patient butter incorporation is what gives the finished sauce its luxurious body and glossy sheen. Every ingredient here is straightforwardly grain-free, so there's no need to audit labels or worry about hidden fillers sneaking into your sauce. It's the kind of recipe that rewards a little attention and makes even a simple grilled steak or roasted vegetables feel like a restaurant-worthy plate.
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Combine the white grape juice, water, chopped tarragon stems, and fennel in a small saucepan over medium heat. Bring to a simmer and cook until the liquid reduces to about 2 tablespoons, 5–7 minutes. Pour through a fine-mesh strainer into a heatproof bowl, pressing the solids to extract all the liquid; discard the solids.
Add the pasteurized egg yolks to the strained reduction in the heatproof bowl and whisk until the mixture is smooth and slightly thickened.
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