Ermine Frosting

Ermine frosting, also known as boiled milk frosting or flour frosting, is a silky, lightly sweetened frosting that's cooked on the stovetop. Its mild, buttery flavor is the perfect finishing touch for your next batch of cupcakes.

Ermine frosting goes by many names, including boiled milk frosting, roux frosting, cooked frosting, and flour frosting. While it takes more effort to prepare than a classic American buttercream frosting, it is significantly less sweet.

Ermine frosting is silky smooth and tastes buttery, with a mild vanilla flavor. While the recipe includes flour, the finished frosting does not taste at all like flour. It's the perfect frosting for those who think buttercream frosting is too sweet.

Pipe ermine frosting onto cupcakes (it holds its shape well), or frost and fill a layer cake. This versatile frosting pairs well with vanilla cupcakes, chocolate cupcakes, and red velvet cupcakes.

Ingredients and substitutions

• All-purpose flour - Flour is necessary to thicken your frosting base and add structure to your finished frosting.
• Granulated sugar - ¾ cup of granulated sugar adds a light amount of sweetness to your frosting. Another ¼ cup of sugar can be added to create a slightly sweeter frosting (the recipe is lightly sweetened as written).
• Salt - Enhances the flavor of your frosting without making it "salty".
• Whole milk - Milk is cooked along with the flour and sugar to make your frosting base. Whole milk is best because it makes your frosting rich and creamy. To make a whole milk substitute with skim milk and heavy cream, add 1.5 tablespoons of heavy cream to a measuring cup, then fill to the 1 cup line with skim milk.
• Unsalted butter - High quality, unsalted butter is best for making a silky, flavorful ermine frosting. If using salted butter, the listed salt can be omitted from the recipe.
• Vanilla extract - Adds depth of flavor to your frosting. Vanilla can be substituted with other extracts to make unique frosting flavors. Peppermint or almond extract can be substituted in at half the amount (their flavors are significantly stronger).

Is ermine frosting better than buttercream?

Ermine frosting makes a great alternative for buttercream frosting if you're looking for a less sweet frosting.

While the main ingredient of both frostings is butter, ermine frosting utilizes a "roux" of sorts to add stability. This "roux", or pudding base, is made with flour, granulated sugar, and whole milk. Buttercream relies on large amounts of confectioner's sugar alone for thickening, which is why it's so sweet.

Buttercream frosting is significantly easier to prepare, taking only five minutes (or less) to whip together in a single bowl.

The pudding base of your ermine frosting must first be cooked on the stovetop, then cooled completely. Last, it's whipped into room temperature butter to create your finished frosting. The entire process can take up to 1.5 hours from beginning to end and requires extra care and effort throughout the process.

Why is it called ermine frosting?

Ermine frosting gets its name from the ermine, a species of weasel with silky, soft white fur.

Does ermine frosting crust?

No, ermine frosting does not crust like traditional buttercream frosting. The reason buttercream frosting crusts is due to the large quantity of sugar added to the frosting. Since ermine frosting is significantly less sweet, it does not contain enough sugar to form a crust after piping.

Tips and tricks

Ermine frosting can be a bit tricky if you've never made a cooked frosting before. Once you get the hang of it, you'll never go back to traditional buttercream!

• Use a whisk - Continue whisking your flour and milk mixture together until no lumps remain. You won't get a smooth pudding base without a whisk.
• Cook until thickened - Your "roux" or pudding base must be cooked until it thickens significantly. The mixture starts out looking essentially like milk, but is ready to come off the heat after it has thickened to a sweetened condensed milk or Elmer's glue consistency (and it will continue to thicken even more as it cools).
• The importance of the pudding base - The purpose of thickening the pudding mixture is to 1) cook the flour, which makes it safe to eat and removes the "raw flour" taste, and to 2) cook out excess moisture, which stabilizes your finished frosting. If your pudding base isn't thickened enough, your frosting will turn out thin.
• Lumpy pudding base? - If your pudding base contains lumps after whisking and cooking, push through a fine mesh sieve before cooling.
• Cool the pudding base completely - Arguably the most important step - make sure your pudding base is cooled completely to room temperature before adding it to the whipped butter. If the pudding mixture is even a little warm, it will melt the butter and turn into a thin, oily mess.
• Cooling alternatives - After covering your bowl, allow it to set at room temperature for 1 to 1.5 hours. To speed up cooling, transfer the pudding mixture to the refrigerator, but don't allow it to go below room temperature. Otherwise, the mixture will thicken too much and become difficult to work with.

Storage

Leftover ermine frosting can be stored in the refrigerator for up to 1 week, or in the freezer for up to 3 months. After bringing to room temperature, rewhip before piping.

Baked goods frosted with ermine frosting can be stored at room temperature for up to six hours after preparing. Otherwise, baked goods should be stored in the refrigerator.

Ermine frosting, made mainly of butter, will melt around 90 to 95 degrees Fahrenheit. If you live in a humid or tropical environment, I recommend storing frosted baked goods in the refrigerator until 30 minutes before serving. Do not display frosted cakes in direct sunlight or outdoors in hot weather - they will melt.

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