Adapted from allrecipes.com
1 cup butter
2/3 cup unsweetened cocoa powder
3 cups white sugar
pinch of salt
1 (12 fluid ounce) can evaporated milk
1 teaspoon vanilla extract
Combine butter, cocoa, sugar, salt and evaporated milk in a saucepan over medium heat. Bring to a boil and boil for 7 minutes. Remove from heat; stir in vanilla. Carefully pour hot mixture into a blender and blend for 2 to 4 minutes. Serve immediately. Store in refrigerator.