
Classic béarnaise is already a showstopper, but this fennel-forward version takes the French sauce somewhere genuinely exciting. The anise-like sweetness of fresh fennel bulb and fragrant tarragon gets concentrated into a silky reduction built on white grape juice and water — no sweeteners needed, and certainly no honey hiding in the base. What you're left with is a bright, herbaceous emulsion that clings beautifully to steak, roasted vegetables, or a perfectly poached piece of fish. The double-hit of tarragon — stems in the reduction, fresh leaves stirred in at the end — gives the sauce real depth without any one flavor overpowering the rest. Whisking the yolks over a gentle bain-marie and bringing them to 160°F keeps everything food-safe while building that lush, velvety texture béarnaise is famous for. Butter goes in one tablespoon at a time, which sounds fussy but is genuinely the move for a sauce that holds together and looks glossy on the plate. It's the kind of recipe that feels impressive but rewards patience more than skill.
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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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