Why Did My Ganache Split?
Ganache is an emulsion — fat and water held together in suspension. When it splits, the emulsion has broken. Here is exactly what causes it, and how to fix it.
The Four Causes of Split Ganache
Every ganache split traces back to one of four root causes. Identify yours before attempting a fix.
1. Cream too hot
Cream above 90°C denatures the lecithin in chocolate — its natural emulsifier. Without lecithin, fat and water cannot bind. Target: 75–80°C.
2. Added all at once
Pouring all the hot cream over the chocolate in one go overwhelms the emulsification. Always add cream in thirds, building the emulsion progressively.
3. Fat ratio too high
Butter added too early, cream with very high fat content, or a ratio heavier than 4:1 can exceed the emulsion's capacity. Add butter only below 34°C.
4. Mechanical shock
Over-stirring while cooling, temperature swings, or refrigerating too fast can collapse the emulsion even in a technically correct ganache.
How to Fix Split Ganache
This method works in most cases. The key is warm cream added gradually — never hot, never all at once.
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Warm the rescue cream
Heat 2–3 tablespoons of heavy cream to exactly 35°C. Warm to the touch. Too cold won't help; too hot will break it further.
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Add one teaspoon at a time
Add the warm cream to the split ganache one teaspoon at a time. Do not pour it all in — the emulsion must rebuild gradually.
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Blend from the centre out
Submerge an immersion blender in the centre of the bowl. Blend in tight circles, slowly moving outward as you see the mixture start to come together. This takes 30–60 seconds.
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Check texture and finish
The ganache should be smooth, glossy, and hold together. If still grainy, add one more teaspoon of warm cream and blend again. Once repaired, use immediately or allow to set at 17°C for 12–24 hours.
Note: If your ganache has fully hardened and split while cold (e.g. after refrigeration), melt it gently over a bain-marie to 35°C before attempting the rescue.
Cream Temperatures by Chocolate Type
The single most effective prevention is controlling cream temperature. These are the working targets:
| Chocolate type | Cream target (°C) | Why |
|---|---|---|
| Dark (55–75%) | 78–80°C | Higher cocoa mass needs more heat to melt fully |
| Milk (30–45%) | 72–75°C | Milk solids lower melt point; less heat needed |
| White | 68–72°C | No cocoa mass — just cocoa butter, very sensitive to heat |
| Ruby / blond | 70–74°C | Delicate flavour compounds degrade above 80°C |
The Physics of a Split Ganache
A split ganache is not random. It is a predictable outcome of measurable physical conditions. Understanding the underlying physics makes every repair faster — and every batch more reliable.
Why Ganache Splits: Stokes' Law & Phase Separation
A stable ganache is an emulsion where fat droplets (discrete phase) are suspended in a sugar-water matrix (continuous phase). Split occurs when the separation rate exceeds the emulsion's ability to maintain suspension.
Stokes' Law: v = [2g · r² · (ρcont − ρdisc)] ÷ (9η)
v = separation velocity (want: v ≈ 0)
r = fat droplet radius → reducing r from 20µm to 2µm cuts v by factor 100
ρ = density difference between phases → balance = stability
η = continuous phase viscosity → more sugar = higher η = slower separation
Root Cause 1: Thermal Shock
Exceeding 50°C melts all existing fat crystals. The emulsion loses its structural scaffolding simultaneously — fat droplets coalesce and the oil phase separates catastrophically. Cannot be prevented by technique alone once this threshold is crossed.
- TriggerCream above 85°C poured directly onto chocolate
- PhysicsAll crystal memory erased; no nucleation sites remain
- FixCool to 28°C; whisk in 5 mL cold cream per 100 g
Root Cause 2: Fat Saturation
When the lipid fraction (L) is too high relative to the water phase (W), the emulsion becomes fat-continuous beyond its stable range. Additional fat has nowhere to disperse — it migrates to the surface as visible oil separation.
- TriggerToo much butter added; wrong ratio for chocolate type
- PhysicsER far above 1.0 → fat phase overwhelms water phase
- FixAdd warm milk 1 tsp at a time; rebuild ER balance
Root Cause 3: Insufficient Homogenisation
Inadequate shear during emulsification leaves fat droplets too large (r > 20µm). Stokes' Law predicts rapid creaming — oil rises to the surface within hours. This manifests as split in storage even in a ganache that looked stable at pouring temperature.
- TriggerStirred by hand only; blender used for <60 seconds
- PhysicsLarge r → v rises as r² → fast separation
- FixRe-warm to 35°C; homogenise 3 min submerged
Complete Emulsion Repair Matrix
Diagnose the root cause before applying any repair. Applying the wrong fix to a split ganache makes recovery impossible.
| Symptom | Root Cause | Diagnostic Question | Repair |
|---|---|---|---|
| Oil on surface, glossy separation | Thermal shock / fat saturation | Did cream exceed 85°C? Was extra butter added? | Cool to 28°C. Whisk in 5 mL cold cream per 100 g |
| Grainy / sandy / gritty | Unstable fat crystal polymorphs or sugar recrystallisation | Was chocolate overheated? Did it cool too quickly? | Re-warm to 34°C over bain-marie. Rest undisturbed 10 min |
| Splits in storage (not at pour) | Insufficient homogenisation — large droplets creaming | Was blender used? For how long? | Re-warm to 35°C. Homogenise 3 min submerged |
| Total collapse — won't re-emulsify | Thermal shock + water contamination | Any steam, condensation, or water drop contact? | Convert to mousse: blend with pasteurised egg yolks, 62°C / 15 min |
| Splits only with fruit purée | Acid-induced emulsion instability | Was glucose added to the purée before combining? | Add 5 g glucose per 100 g purée. Re-warm and blend |
Prevention is always cheaper than repair. Every split in the repair matrix above is prevented by the same three disciplines: temperature control (never exceed 50°C in the combined mass), droplet size control (3 min blending per kg), and emulsion balance (correct ratio for chocolate type before starting).
Frequently Asked Questions
Why is my ganache grainy?
Grainy ganache usually means the chocolate overheated — cocoa butter separated and recrystallised incorrectly — or the cream temperature caused the lecithin to break down. The rescue method above also works for grainy ganache.
What is the difference between split and seized ganache?
Split ganache is oily and liquid — the emulsion has broken and fat has separated out. Seized ganache is thick and lumpy — caused by water contamination (a wet bowl or utensil) making the chocolate particles clump. The fixes are different: seized ganache needs more liquid added; split ganache needs re-emulsification.
Can I still use split ganache?
Only if it cannot be rescued. Split ganache will have incorrect texture, poor shelf life, and the fat may bloom after setting. Always attempt the immersion blender rescue first.
Does adding lecithin prevent splitting?
Sunflower or soy lecithin (0.2–0.5% of total weight) can improve emulsion stability, particularly in high-fat formulas or ganaches using alternative liquids (fruit purées, alcohol). It is not a substitute for correct technique, but a useful safety margin in complex formulas.
Related Science
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