Chocolate Fudge Icing

This is fudge frosting the way it was made before buttercream took over, a true cooked icing that sets rich, glossy, and almost candy-like on top of a cake. Just milk, sugar, salt, and grated chocolate, with no butter and no powdered sugar.

It’s really candy-making in disguise. You boil the mixture to the soft-ball stage, the very point that makes fudge, and that’s what gives the icing its dense, fudgy set once spread.

Two details make or break it. First, cook it covered for a couple of minutes at the start so the steam washes any stray sugar crystals down the sides of the pan, the enemy of smooth icing. Second, don’t stir or jostle it once it comes off the heat. Let it cool undisturbed, then beat until it thickens and loses its sheen, which is your cue to spread fast.

Pro Tips

• Use a candy thermometer for the soft-ball stage, about 234 to 240°F (112 to 116°C). Guessing is the usual cause of icing that won’t set or sets rock hard.
• Don’t stir while it boils or scrape the pan sides, which seeds crystals and makes grainy icing.
• Beat just until it thickens and dulls, then spread quickly; it firms up fast as it cools.
• If it stiffens too soon, beat in a few drops of hot milk to loosen it.

Variations

• Stir in a teaspoon of vanilla or a splash of strong coffee once off the heat for depth.
• Beat in a tablespoon of butter for a glossier, richer icing.
• Use it warm as a pourable glaze, or fully beaten as a spreadable frosting.