
Classic béarnaise already skips yeast entirely, but this fennel-forward version takes things up a notch with a reduction built from white grape juice, fresh tarragon stems, and finely chopped fennel bulb — no wine, no vinegar, no fermented ingredients anywhere in sight. The result is a silky, buttery sauce with a subtle anise sweetness that feels genuinely restaurant-worthy. Whisking pasteurized egg yolks over a double boiler is the key technique here: gentle, steady heat transforms them into a stable, glossy base that holds all that rich butter without breaking. Adding the unsalted butter one tablespoon at a time is what gives the sauce its luxurious, spoon-coating texture — patience really pays off at this step. A final stir of fresh tarragon leaves brightens everything up and keeps the herbal flavor clean and vibrant rather than muddy. Drizzle it over grilled fish, roasted vegetables, or a perfectly cooked steak 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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