1 cup sugar
9 tablespoons cocoa powder
¼ cup water
½ cup light corn syrup
1 cup evaporated milk
1 teaspoon vanilla

Boil first 4 ingredients to firm ball stage (244-248 degrees on candy thermometer).  Remove from heat.  Add the evaporated milk and vanilla.  Stir well.  Pour in a jar and cool.  The mixture will seem runny at first but will thicken as it cools.