True Orange Sabayon

Directions

1. 1
   Combine all the ingredients in a medium nonreactive bowl.
2. 2
   Set up a double boiler, adding 3 inches of water to the bottom pot.
3. 3
   Bring to the boil.
4. 4
   Whisk the ingredients until frothy.
5. 5
   Pour into the double boiler and continue to whisk until the sauce is lightly thickened, about 7 minutes.
6. 6
   If the sauce seems to be thickening too rapidly, lift the top pot off the heat, whisking continuously to disperse heat.
7. 7
   Return the pan to the double boiler and continue whisking until done.