Traditional Ermine Frosting (Cooked Flour Buttercream)

Traditional ermine frosting is a cooked flour frosting built from three main components: a thickened milk-and-flour base, butter, and sugar. The result is a silky, stable frosting with a light, creamy structure. It is sometimes described as old fashioned frosting and is closely related to what many bakers call boiled milk frosting or flour buttercream, depending on local tradition and wording.

What Is Traditional Ermine Frosting?

What distinguishes it from many other frostings is the method of thickening. Rather than relying on egg yolks, cream cheese, or powdered sugar alone, ermine frosting uses flour gelatinization. Flour is cooked in milk until it becomes a smooth paste. After cooling, the paste is whipped into butter and sugar, creating a texture that can feel both delicate and sturdy.

Because it is not overly sweet and holds shape well, ermine frosting is frequently used as a red velvet cake frosting. It can also pair with vanilla, chocolate, and spice cakes where you want a frosting that tastes more like a classic dessert cream than a confectioners sugar paste.

Essential Concepts

• Cook flour in milk to make a smooth paste, then cool completely.
• Whip the cooled paste with butter and sugar until creamy and stable.
• Correct temperature prevents graininess and oil separation.
• Works well for red velvet cake frosting and traditional layer cakes.

Why Cooked Flour Changes the Texture

Ermine frosting depends on starch science. Flour contains starch granules. When heated with milk, starch absorbs liquid and swells. As the mixture thickens, the starch gelatinizes, forming a stable network. Once the mixture is cooked to a thick, pudding-like consistency and then cooled, that network helps the frosting set without relying solely on powdered sugar.

This is part of why people describe it as less “powdery” than many buttercreams. It also explains why errors in cooking or cooling produce predictable failures, such as:

• Graininess from undercooking or partial cooling
• Loose frosting from insufficient cooking or warm ingredients
• Oiliness from mixing butter into a base that is too warm or too far past cooling

Ingredients for How to Make Ermine Frosting

Below is a traditional, reliable formula. It aligns with the approach commonly used when bakers discuss how to make ermine frosting for classic layer cakes and red velvet cake frosting.

Core Ingredients

• Whole milk: 2 cups (480 ml)
• All-purpose flour: 4 tablespoons (30 g)
• Granulated sugar: 3/4 cup (150 g), divided
• Unsalted butter: 2 cups (454 g), softened
• Fine salt: 1/4 teaspoon
• Vanilla extract: 2 teaspoons (optional but common)

Some traditional variations omit vanilla or use a small amount of lemon zest. The core technique is the same.

Equipment

• Medium saucepan
• Whisk
• Heat-resistant spatula
• Fine-mesh strainer (optional but helpful)
• Mixing bowl (stand mixer or hand mixer)
• Plastic wrap or parchment for covering the base while cooling

Step-by-Step: Traditional Ermine Frosting Method

Step 1: Cook the Flour Mixture

1. In a medium saucepan, whisk together the milk and flour until no dry flour remains.
2. Add 1/2 cup (100 g) of the granulated sugar.
3. Cook over medium heat, whisking constantly.
4. The mixture will transition from thin to thick. Continue cooking until it becomes a smooth, thick paste that resembles soft pudding. This usually takes 8 to 12 minutes.
5. Maintain a consistent whisking pattern, especially along the bottom and corners, to prevent scorching.

At this stage, the base should leave a visible trail when you run a spoon through it.

Optional refinement: strain the base

If you notice lumps, pour the mixture through a fine-mesh strainer while it is hot. This step is not required in every kitchen, but it improves smoothness for people aiming for a classic, uniform texture.

Step 2: Cool Completely

1. Remove the saucepan from the heat.
2. Press plastic wrap directly onto the surface. This prevents a skin from forming.
3. Cool to room temperature, then chill until the base is thoroughly cold.

A practical target is refrigerator temperature for mixing, typically 2 to 4 hours. Even if the base feels cool, it can still be warmer than butter. For dependable results, treat “cool completely” as a requirement rather than a suggestion.

Step 3: Cream the Butter and Finish the Base

1. In a mixing bowl, beat the softened butter with the remaining sugar (1/4 cup, 50 g) and salt until pale and aerated. This can take 2 to 4 minutes.
2. Check the cooled flour base. It should be cool enough that it does not soften the butter immediately.
3. Add the flour base to the butter in small additions.
4. Mix on medium speed just until smooth.
5. Add vanilla near the end.

The texture should shift from separated-looking to cohesive cream as the mixture emulsifies. If the base is too warm, the butter can break. If it is too cold and stiff, the mixture may resist blending. Both issues are solvable, but temperature control is the simplest safeguard.

How to Make Ermine Frosting Without Common Failures

Graininess

Cause: Undercooked flour base, inadequate stirring, or failure to strain lumps.
Prevention: Whisk constantly, cook until thick and glossy, and consider straining.
Remedy: Blend the base briefly if it has lumps. If already whipped into frosting, you can gently warm the mixture over a very low speed with a brief pause and mixing, but usually the best fix is to re-make the cooked base.

Loose or Soft Frosting

Cause: Base not cooked thick enough, base too warm, or butter too soft relative to the base.
Prevention: Cook to a clearly thick consistency. Chill until properly cold.
Remedy: Chill the frosting 15 to 30 minutes, then re-whip. Avoid long warm periods, which can lead to butter breakdown.

Oil Separation or “Broken” Texture

Cause: Base too warm when combined with butter, or overmixing after the emulsion breaks.
Prevention: Ensure both components are cool but still blendable.
Remedy: Chill briefly to firm the fat, then mix again. If it persists, gently cool the mixture and re-whip. For severe breaks, re-whipping after temperature adjustment often restores cohesion.

Flavor and Pairing: Traditional Use Cases

Red Velvet Cake Frosting

When people ask for red velvet cake frosting using traditional ermine frosting, they typically want a frosting that is less sweet than many buttercreams and that does not overpower cocoa and vanilla notes. The milk-and-flour base contributes body without tasting “cooked” in the final product when vanilla is used and the flour is properly cooked.

To pair effectively:

• Use vanilla for classic balance.
• Add a small amount of cocoa if you are making a chocolate variation, but keep the technique unchanged.
• Consider adding a teaspoon of cream cheese only for specialized tang, though that moves away from pure traditional ermine.

If you’re exploring other red velvet frosting styles, you may also like Best Frosting for Red Velvet Cake and Cupcakes.

Plain Vanilla and Chocolate Variants

For vanilla: vanilla extract is usually sufficient.
For chocolate: substitute a portion of flour cooking liquid with cocoa powder is possible, but it can disrupt thickening. A more stable approach is to add melted and cooled chocolate carefully after the base is cooked and cooled, mixing just until incorporated. If you choose to do this, keep the temperature consistent so butter does not separate.

Storage and Make-Ahead Practice

Ermine frosting can be stored, but handling matters.

• Refrigerate in an airtight container for up to 3 to 5 days.
• For best texture, bring the frosting to cool room temperature, then re-whip briefly before use.
• Freeze in sealed portions for up to 2 months. Thaw in the refrigerator, then re-whip.

Because ermine frosting relies on an emulsion of fat and starch-thickened base, re-whipping is often necessary after chilling. Expect the first few minutes to feel uneven, then become smooth with continued mixing.

For more on food safety basics when using dairy, see the USDA Food Safety basics.

Recipe: Traditional Ermine Frosting (Flour + Boiled Milk Method)

Yield

Enough to frost a two-layer 8- or 9-inch cake, or to frost a small batch of cupcakes. Adjust quantity based on thickness and coverage.

Ingredients

• 2 cups whole milk (480 ml)
• 4 tablespoons all-purpose flour (30 g)
• 3/4 cup granulated sugar (150 g), divided
• 2 cups unsalted butter (454 g), softened
• 1/4 teaspoon fine salt
• 2 teaspoons vanilla extract

Directions

1. Whisk milk and flour together in a saucepan until smooth.
2. Add 1/2 cup sugar and cook over medium heat, whisking constantly.
3. Cook 8 to 12 minutes until the mixture becomes thick and smooth, like soft pudding.
4. Remove from heat. Strain if needed for smoothness.
5. Cover with plastic wrap touching the surface. Cool to room temperature, then refrigerate until cold.
6. Beat softened butter with remaining 1/4 cup sugar and salt until pale and fluffy.
7. Add the cold flour base to the butter gradually, mixing until smooth.
8. Add vanilla. Mix until uniform.

Troubleshooting Quick Guide

• Your base never thickened: The mixture likely did not reach adequate heat or time. Return to heat and cook longer, whisking.
• Your base cooled but looks too stiff: It may be overcooked. Whisk briefly and warm slightly, then cool again before combining with butter.
• Your frosting feels gritty: Strain the base next time. You can also remix thoroughly while slightly chilling, but do not rely on sugar dissolution, since the starch gel is what defines texture.
• Your frosting is too soft to pipe: Chill, then re-whip. If piping still fails, the butter may have been too warm at mixing time.

FAQ

What is traditional ermine frosting?

Traditional ermine frosting is a cooked flour frosting made by thickening milk and flour into a smooth paste, cooling it, and then whipping it with butter and sugar. It is sometimes called boiled milk frosting or flour buttercream and is commonly used as old fashioned frosting on layer cakes.

How does ermine frosting compare to buttercream?

Many American buttercreams rely on powdered sugar as the main structural ingredient. Ermine frosting uses starch gelatinization from cooked flour to provide structure. The flavor is typically less sweet and more “cream-like,” with a stable texture when cooked correctly and mixed at proper temperatures.

Can I make ermine frosting for red velvet cake?

Yes. Many bakers use ermine frosting as red velvet cake frosting because it complements cocoa and vanilla notes without tasting excessively sugary. The technique is the same; flavor adjustments are usually limited to vanilla and optional cocoa.

Why must the flour mixture cool completely?

Because butter emulsifies differently at different temperatures. If the flour base is warm, it can melt the butter and cause separation. If it is too cold and stiff, it may not incorporate smoothly. Cooling to the appropriate cold stage improves cohesion and smoothness.

Can I fix broken ermine frosting?

Often. Chill the frosting to re-firm the fat, then re-whip. If it remains broken, temperature is usually the issue. Adjusting temperature and mixing again can restore emulsion. If the flour base was undercooked, re-making may be necessary.

Does ermine frosting need to be refrigerated?

Yes. It contains dairy and a cooked flour base. Store in the refrigerator in an airtight container. For best texture, re-whip after chilling and allow the frosting to soften slightly at room temperature before decorating.

How long does ermine frosting last?

Typically 3 to 5 days in the refrigerator, depending on freshness of ingredients and storage conditions.

Conclusion

How to make ermine frosting comes down to controlled cooking, complete cooling, and temperature-aware mixing. The flour-and-milk base should be cooked until thick and smooth, then cooled until it no longer softens the butter. Once that foundation is correct, whipping produces a classic texture associated with traditional ermine frosting and old fashioned frosting traditions. When done well, it functions reliably as flour buttercream and works especially well as red velvet cake frosting, delivering a creamy sweetness that is grounded in starch structure rather than powdered sugar alone.