Chocolate Sauce

Bahan-bahan (24 porsi)

• 4 ounces bittersweet chocolate, (chopped)
• 1½ cups granulated white sugar
• 1/2 cup (1 stick) unsalted butter, (cut into 1-tablespoon pieces)
• 1/3 cup unsweetened cocoa powder
• 1 cup heavy whipping cream
• 2 teaspoons vanilla extract