• 2 tablesp. wine vinegar
• 2 egg yolks
• 2–4 oz. butter

Boil the vinegar till it is reduced by half; allow to cool. Mix the cool vinegar with the egg yolks in a basin and place this over hot water. Whisk the egg yolks till they begin to thicken, then whisk in the butter gradually until all is absorbed. Season, add lemon juice to taste and serve immediately.

Serve with fish or vegetables.