How To make Chilled Ehu & Molokai Sweet Potato Soup

1/4 lb Ehu, mahimahi, or snapper
6 c Fish stock*
2 tb Unsalted margarine
1/2 c Diced leeks
1/4 c White wine
1 1/2 lb Molokai sweet potatoes

pared and diced 1/3 c Chopped limu
Salt and white pepper :

to taste 1 c Skim milk
Blanch ehu in 2 cups of the fish stock; remove, dice, and chill. In a sauce pot, heat margarine; saut