Fudge-type icings are rich and heavy. Many of them are made somewhat like candy. Their predominant ingredient is sugar, and they contain less fat than buttercreams. Fudge icings may be flavored with a variety of ingredients and are used on cupcakes, layer cakes, loaf cakes, and sheet cakes.
Fudge icings are stable and hold up well on cakes and in storage. Stored icings must be covered tightly to prevent drying and crusting.
To use stored fudge icing, warm it in a double boiler until it is soft enough to spread.