Mustard Sauce

• 3 tablespoons (50 g) softened butter
• 2 tablespoons lemon juice

It’s best to use a double boiler to make this sauce.

Heat a little water in the bottom of the double boiler. Break the butter into ten pieces. Place the butter, lemon juice, egg yolks, and a little salt and pepper in the top; set over the hot water and whisk vigorously until the mixture begins to thicken. Whisk in the cold water, remove the sauce from the heat, pour into a clean bowl, a