Hot Fudge Sauce

from Joy of Cooking

1/2 cup sugar
1/4 cup unsweetened cocoa powder
1/4 teaspoon salt
1/2 cup water
1 cup heavy cream
1 cup light corn syrup
1/4 teaspoon distilled white vinegar
4 ounces semisweet chocolate, coarsely chopped and divided
1/4 cup (1/2 stick) butter, softened
1 tablespoon vanilla

Mix sugar, cocoa and salt in a large, heavy saucepan. Whisk in the water until well blended. Bring to a simmer over medium-high heat. Remove from the heat and whisk in the cream, corn syrup, vinegar and 1/2 of the chopped chocolate.

Return to medium-high heat and boil. Whisk frequently until the bubbles become small and the syrup is thick and sticky, 5-7 minutes (or 225 degrees on a candy thermometer). Remove from the heat and add the rest of the chopped chocolate, butter, and vanilla. Whisk until smooth. Serve at once, or let cool. Cover and refrigerate up to 2 weeks. Reheat over low heat.
from Joy of Cooking

1/2 cup sugar
1/4 cup unsweetened cocoa powder
1/4 teaspoon salt
1/2 cup water
1 cup heavy cream
1 cup light corn syrup
1/4 teaspoon distilled white vinegar
4 ounces semisweet chocolate, coarsely chopped and divided
1/4 cup (1/2 stick) butter, softened
1 tablespoon vanilla

Mix sugar, cocoa and salt in a large, heavy saucepan. Whisk in the water until well blended. Bring to a simmer over medium-high heat. Remove from the heat and whisk in the cream, corn syrup, vinegar and 1/2 of the chopped chocolate.

Return to medium-high heat and boil. Whisk frequently until the bubbles become small and the syrup is thick and sticky, 5-7 minutes (or 225 degrees on a candy thermometer). Remove from the heat and add the rest of the chopped chocolate, butter, and vanilla. Whisk until smooth. Serve at once, or let cool. Cover and refrigerate up to 2 weeks. Reheat over low heat.