Fast Fudge Frosting

From my mother’s card file:

INGREDIENTS:

• 1 package powdered sugar
• 1/4 teaspoon of salt
• 1/2 cup of dry cocoa
• 1/3 cup of boiling water
• 1/3 of softened (real) butter
• 1 teaspoon of vanilla

DIRECTIONS:

(... Full Fast Fudge Frosting recipe)