Robert sauce

Ingredients

  • 1/2 teaspoon sugar
  • 1 teaspoon freshly squeezed lemon juice
  • 2 tablespoons unsalted butter
  • 1/2 cup coarsely chopped onions
  • 1 cup white wine
  • 1 quart demi-glace
  • 2 teaspoons dry mustard

Preparations

    step 1

    In a small bowl, combine sugar and lemon juice, and stir until the sugar is dissolved.

    step 2

    In a heavy-bottomed saucepan, melt butter and cook onions over medium heat until soft and translucent. Don't let them turn brown.

    step 3

    Add wine. Bring to a boil, then lower the heat a bit and continue simmering until the liquid has reduced by two-thirds.

    step 4

    Add demi-glace, then lower heat to a simmer and reduce for about 10 minutes.

    step 5

    Strain through a mesh strainer.

    step 6

    Add mustard and the sugar-lemon mixture, and mix well. Serve immediately.