In a medium saucepan, blend Granulated Sugar (2 cup), All-Purpose Flour (5 tablespoon), Instant Espresso Powder (1 tablespoon), Salt (1/2 teaspoon), and Unsweetened Cocoa Powder (2/3 cup). Add Evaporated Milk (12 fluid ounce), Water (1/2 cup), and Butter (2 tablespoon).
Cook over medium heat, stirring constantly until sauce begins to bubble and thicken, about 20 minutes. Remove from heat, and stir in Vanilla Extract (1/2 teaspoon). Serve alongside the dessert of your choice, and enjoy!