Why did my buttercream split or go grainy?
Temperature is nearly always the answer — and both split and grainy buttercream are recoverable.
- Difficulty
- beginner
- Time
- 10 min
- Read
- 2 min
Short answer
Split buttercream is too cold or too warm, and both are fixable. Warm the bowl briefly and keep beating for the cold case; chill it for fifteen minutes and re-beat for the warm one. Grainy usually means undissolved sugar.
Buttercream is an emulsion of fat and liquid, and it breaks at both ends of the temperature range. Almost nobody needs to throw it away — it looks unrecoverable and it very rarely is.
Step by step
- Work out which problem you have.Split and curdled-looking with visible lumps of butter: temperature. Smooth but gritty on the tongue: undissolved sugar. Different fixes.
- For split and cold, warm it gently.Hold the bowl over warm water for a few seconds, or warm a small amount and beat it back in. Then beat for several minutes — it usually comes together suddenly.
- For split and warm, chill it.Fifteen to twenty minutes in the fridge, then beat again. Soupy buttercream is warm butter, and it will not fix while it stays warm.
- Keep beating longer than feels reasonable.Five minutes or more. Buttercream frequently looks wrong right up until the moment it comes together.
- For grainy, use icing sugar and sift it.Granulated or caster sugar will not dissolve in butter. Icing sugar, sifted, is what gives a smooth result.
- Beat the butter properly before adding sugar.Pale and fluffy first, several minutes. Adding sugar to cold hard butter is where most graininess starts.
- Add liquids slowly and at room temperature.Cold milk or cream into room-temperature butter splits it. A little at a time, beating between.
- Beat slowly at the end to remove air.A minute on the lowest speed knocks out air bubbles and gives a smoother finish for piping.
Tips
- Room temperature butter means about 18-20°C — cool to the touch and it should hold a finger dent without being greasy. Softened in the microwave is usually too warm.
- If it is grainy from sugar and already made, beating in a spoonful of hot milk sometimes dissolves the remaining crystals.
- Meringue-based buttercreams are far more stable than the simple butter-and-icing-sugar kind, if you keep having trouble.
If it doesn't work
Looks curdled with butter lumps
Cause: Too cold — Fix: Warm the bowl briefly and beat for several minutes.
Soupy and will not hold shape
Cause: Too warm — Fix: Chill for 15-20 minutes and beat again.
Smooth but gritty to eat
Cause: Wrong sugar, or not sifted — Fix: Use sifted icing sugar. Beating in a little hot milk can rescue a made batch.
Full of air bubbles when piped
Cause: Beaten too fast at the end — Fix: Beat on the lowest speed for a minute to knock the air out.
Questions people ask
Can split buttercream be saved?
Almost always. Work out whether it is too cold or too warm, correct the temperature, and beat for several minutes — it usually comes together suddenly.
Why is my buttercream gritty?
Granulated or unsifted sugar. Buttercream needs sifted icing sugar; other sugars do not dissolve in fat.