Ermine Frosting (Boiled Flour Frosting)
This is the “old-school” frosting originally used for Red Velvet cake. It’s unique because it starts with a cooked flour paste (a roux), which creates a silky, whipped texture that tastes like a cross between whipped cream and traditional buttercream but is much less sweet.
Quick Specs
- Prep Time: 15 mins (mostly cooling time).
- Cook Time: 5–7 mins.
- Total Time: 25 mins (plus cooling).
- Servings: Enough for 12–15 cupcakes or a 2-layer cake.
- Cost: Under $5. It uses basic pantry staples like flour, sugar, and milk.
The 5 Ingredients
- All-Purpose Flour (5 tbsp): Your thickening agent.
- Granulated Sugar (1 cup): Cooked with the flour to dissolve completely (no grainy frosting!).
- Whole Milk (1 cup): The base for your “pudding” roux.
- Unsalted Butter (1 cup/2 sticks): Room temperature and softened.
- Vanilla Extract (1 tsp): For that classic bakery aroma.
Phase 1: The “Pudding” Base
You aren’t just mixing ingredients; you’re making a starch paste.
- What to do: In a small saucepan, whisk the flour, sugar, and milk together until smooth.
- The Heat: Cook over medium heat, stirring constantly, until it thickens into a heavy, glue-like paste (similar to thick pudding).
- The Science: Heating the flour and milk causes the starch granules to swell and burst (gelatinization). This provides the structural “backbone” of the frosting without needing pounds of powdered sugar.
Phase 2: The Critical Cool-Down
If you add butter to hot paste, you get a greasy soup.
- What to do: Transfer the paste to a bowl and cover with plastic wrap (touching the surface so a “skin” doesn’t form). Let it cool completely to room temperature.
- The Logic: The paste and the butter must be the same temperature to emulsify properly.
Phase 3: The Creaming Step
- What to do: In a separate large bowl, beat the softened butter with a mixer until it’s pale and fluffy (about 3 minutes).
- The Logic: You are incorporating air into the fat, which gives the frosting its “light-as-air” volume.
Phase 4: The Emulsion
- What to do: Add the cooled flour paste to the butter one tablespoon at a time, beating constantly. Add the vanilla at the end.
- The Indicator: It might look curdled for a second—keep beating! It will suddenly transform into a glossy, cloud-like frosting that looks like whipped cream.
- The Science: By adding the paste slowly, you are forcing the fat (butter) and water (milk paste) to bind together into a stable emulsion.
Phase 5: The Taste Test
- The Result: Unlike American buttercream, which can be tooth-achingly sweet, Ermine frosting is buttery and mild. Because the sugar was dissolved in the hot milk, the texture is perfectly smooth with zero grit.
Serving
- Storage: Since it’s made with a milk-base, keep the cake in the fridge if you aren’t eating it within a few hours.
- Next Step: This is the perfect partner for Red Velvet Cake or a Dark Chocolate Cake. It’s also stable enough for basic piping and swirls.