Puree all ingredients together well, adding sake or other dry white wine to the desired consistency, then chill for at least 1 hour.
Serve as dressing.
Also good with crab cakes!
Note: make sure to use a fully ripe avocado for this recipe! It needs to be ripe and rich - Californian (Haas or Gwen) avocados have a buttery and richer flavor than avocados from Florida or other areas. Otherwise your dressing will come out tasting a little flat.