Sue s Hot Fudge Sauce

1 cup butter

⅓ cup unsweetened cocoa powder

3 cups white sugar

1 (12 fluid ounce) can evaporated milk

1 teaspoon vanilla extract

Combine butter, cocoa, sugar 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.