I had never made homemade hot fudge when I tried this. It is so rich and delicious, it was dificult for me to stay out of it. No matter how hard I tried, it seemed to be staring at me everytime I opened the fridge. It is worth the effort to make this over store bought hot fudge.
1/2 cup sugar
1/4 cup 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 (about 2/3 cup) semisweet chocolate, coarsely chopped and divided
1/4 cup butter, softened
1 Tablespoon. vanilla extract
Mix sugar, cocoa and salt in a heavy saucepan. Whisk in the water and bring to a simmer over medium-high heat, stirring constantly. Remove from the heat and whisk in the cream, corn syrup, vinegar and about 1/3 cup of the chocolate.
Return to medium-high heat and boil for 5-7 minutes, whisking until it is thick and sticky and the bubbles are small. . 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.
Source: Mel's kitchen cafe