2 tablespoons boiling water
1 tablespoon instant espresso powder or instant coffee powder
1 cup sugar
2 tablespoons unsweetened cocoa powder
1 cup whipping cream
1/4 cup light corn syrup
2 ounces semi sweet chocolate
2 tablespoons (1/4 stick) unsalted butter
1 teaspoon vanilla
Heat two tablespoons of water in the microwave until boiling and stir in coffee powder until dissolved. Stir together sugar and cocoa in a heavy medium saucepan. Whisk in 1 cup cream, corn syrup, and coffee mixture. Add chocolate and butter. Bring to boil over high heat, stirring constantly, and boil for 1-2 minutes. Reduce heat to medium and simmer until slightly thickened, stirring occasionally, about 4 minutes. Cool 30 minutes. Stir in vanilla. If, after the sauce has cooled, the thickness isn't to your liking, bring it to a full boil once again and boil for another minute.