Uncle Bills Hot Fudge Sauce

In the top of a double boiler over gently simmering water, melt the
chocolate, stirring occasionally. Remove from the heat. In a bowl,
stir together the sugar and the water until all the granules of sugar
have dissolved. Stir the dissolved sugar mixture and the corn syrup
thoroughly into the chocolate until all are absorbed. Return the pan
to low heat and stir in the margarine and the vanilla. Serve at once
or cool, cover, and refrigerate in 1 cup containers. Reheat to the
desired temperature before serving.

Yield: 6 cups.