
Classic béarnaise is one of those sauces that feels impossibly luxurious, and this fennel-forward version takes it somewhere even more interesting. The anise-sweet fennel bulb and fragrant tarragon steep into a white grape juice reduction that forms the flavor backbone of the whole sauce — bright, herby, and a little floral. Because the only proteins here come from egg yolks and butter, there's no red meat or meat-derived ingredients anywhere in the recipe, making it a genuinely elegant option when you need to keep things safe without sacrificing sophistication. The double-boiler method and continuous whisking coax the yolks into a silky, spoonable emulsion that clings beautifully to whatever you're serving it with. Pasteurized egg yolks are used here, and the sauce is brought to 160°F, so you're getting both food-safety peace of mind and that glossy, restaurant-quality finish. Spoon it over roasted vegetables, grilled fish, or steamed potatoes and it instantly elevates the whole plate. It's the kind of sauce that makes people ask what your secret is.
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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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