Cut the butter into small pieces and place it on a plate to use later.
In a medium pot, combine the wine, vinegar, and shallots. Cook over high heat until it boils and let it simmer until it has reduced to just 1/4 cup.
Pour the wine mixture into a double boiler and, using a whisk, add the egg yolks, water, and pepper, mixing well while cooking the sauce for about 10 minutes.
When the sauce starts to bubble at the edges of the pot, reduce the heat to very low and, using a whisk, incorporate the butter piece by piece until the sauce has thickened.
Remove the sauce from the heat and stir in the salt.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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