
This silky, emulsified sauce takes the classic French béarnaise in a bright, aromatic direction — swapping tarragon and vinegar for zingy lime juice, fresh ginger, and a splash of dry white wine. The result is something rich and buttery yet lively, with a gentle heat from the ginger and a citrusy lift that makes it feel almost tropical. It's the kind of sauce that turns a simple piece of grilled fish or roasted vegetables into something genuinely impressive. Because the entire ingredient list is built around fresh aromatics, eggs, butter, and wine, there's absolutely nothing here that would concern anyone avoiding oats or oat-derived additives — no thickeners, no fillers, no surprises. The bain-marie technique keeps the egg yolks gently cooked to a safe 160°F without scrambling them, and adding the cold butter cubes one at a time is what gives the sauce that glossy, restaurant-quality finish. It does take a little patience and constant whisking, but the payoff is a pourable, velvety sauce that tastes like it came from a professional kitchen.
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Combine the lime juice, white wine, rice wine vinegar, grated ginger, minced shallot, and white pepper in a small saucepan over medium heat. Bring to a simmer and cook until the liquid is reduced to about 1 tablespoon, 4–5 minutes. Strain through a fine-mesh strainer into a heatproof bowl, pressing on the solids; discard the solids. Let the reduction cool for 2 minutes.
Add the pasteurized egg yolks and cold water to the bowl with the cooled reduction and whisk until the mixture is pale and slightly thickened, about 1 minute.
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