
Classic béarnaise is already a showstopper, and this fennel-forward version takes that buttery, herb-laced richness somewhere genuinely exciting. The anise-like sweetness of finely chopped fennel bulb weaves through the reduction alongside fresh tarragon, giving the finished sauce a floral, slightly vegetal depth that feels both classic and unexpected. A splash of white grape juice stands in for the traditional white wine, keeping the acidity bright and clean without any fermented notes. The double-boiler method and careful butter incorporation are what make this sauce silky rather than scrambled — patience with those one-tablespoon additions really does pay off. Because every ingredient here is whole and straightforward, there's no need to scan labels for hidden spice blends or seasoning mixes that might sneak in unwanted heat or root extracts. Spoon it over grilled steak, roasted asparagus, or poached fish and watch it disappear fast.
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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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