
Classic béarnaise is already a showstopper, but this version layers in the subtle anise sweetness of fresh fennel for something that feels genuinely special. The reduction starts with white grape juice and water instead of wine, which keeps the flavor bright and slightly fruity while still building that aromatic backbone alongside the tarragon stems. Once strained, the liquid becomes the base for a silky emulsion built up one pat of butter at a time — patience here is everything, and the result is a sauce that's luxuriously thick and glossy. Pasteurized egg yolks are used throughout, and the double-boiler method brings them up to a safe 160°F, so there's no guesswork about food safety. The finishing touch of finely chopped fresh tarragon leaves keeps the herb flavor vivid and green rather than muted. This sauce is stunning spooned over grilled fish, roasted vegetables, or a perfectly seared steak — anywhere you want richness with a little herbal lift. Every ingredient here is straightforward and nut-free by nature, so you can focus entirely on the technique and the flavor.
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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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