Grapefruit Beurre Blanc

Directions

1. 1
   Zest 1 teaspoon of a grapefruit, and squeeze 1/2 cup of juice.
2. 2
   Cut away the peel and pith from the remaining grapefruits, and cut out each segment. Chop the segments to measure 1/2 cup, and reserve 1 cup worth of whole segments.
3. 3
   In a small sauce pan, bring the grapefruit juice, wine, shallot, and vinegar to a boil, and let the mixture reduce to about 1 tablespoon.
4. 4
   Reduce the heat to low, and whisk in 1 tablespoon of butter at a time. You may wish to lift the pan from time to time to cool the sauce. Add another tablespoon of butter before the previous piece has completely melted until you have used all of the butter.
5. 5
   Stir in the chopped fruit segments and season with salt and pepper to taste. If you wish, you may add some of the whole segments upon serving.
6. 6
   Use immediately or pour sauce into a double boiler to keep warm and prevent separation.