Why ganache splits in a Bengaluru kitchen: ratio, heat, and the fix that isn't more cream

A ganache that looks glassy and smooth coming off the stove can turn grainy and oily by the time it reaches the cake, and it usually isn't the chocolate's fault. Ganache is an emulsion of melted chocolate fat and cream, and an emulsion holds together right up until it doesn't. Two separate mistakes cause almost every split: not enough cream for the chocolate in the bowl, or too much heat applied while getting there. Knowing which one happened decides whether the fix takes thirty seconds or a fresh batch.

Why a ratio problem looks the same as a heat problem

Both failures end up looking identical: a slick, separated layer of fat sitting on top of a grainy paste. That similarity is why so many home bakers reach for the same fix regardless of cause, and why the fix so often doesn't work. A ganache broken by too little liquid needs more liquid. A ganache broken by heat needs the fat given room to recombine, not more of the ingredient that's already overwhelming it.

The ratio isn't one number

Callebaut's own breakdown of ganache ratios by application shows why a single chocolate-to-cream number never covers every ganache. A softer pastry ganache built around a 66 percent dark couverture runs close to 40 percent chocolate, 20 percent cream, 20 percent milk and 20 percent glucose syrup, loose enough to pour or fill a tart shell. A firmer confectionery ganache meant to be cut and enrobed, using the same chocolate, runs closer to 49.9 percent chocolate and 26.9 percent cream, with invert sugar, salt and extra cocoa butter added to hold its shape. Same chocolate, same cream, two different jobs, two different ratios. A home baker copying a cake-covering ratio into a bonbon filling, or the other way round, is often looking at a genuine ratio mismatch, not a mixing mistake.

Dark, milk and white chocolate don't take the same ratio either

Chocolate type adds a second variable on top of application. A dark couverture is mostly cocoa solids and cocoa butter with comparatively little sugar or milk fat, and it can absorb a fair amount of cream before the emulsion gives up. Milk and white chocolate carry more sugar and milk solids and less cocoa butter to start with, so the same cream ratio that works for a 66 or 70 percent dark bar will turn a white chocolate ganache into a puddle. A recipe that just says chocolate, without naming which kind, is missing the one variable that decides whether its stated ratio will hold in your bowl.

Heat breaks it a different way

King Arthur Baking describes what happens when ganache is overheated on a stovetop or blasted too hard in a microwave: the chocolate's fat clusters into tight little groups and refuses to disperse back into the cream, which looks like a ratio problem but isn't one. A ganache heated too fast can split even when the ratio was correct on paper, because the emulsion needed time and gentle heat to form in the first place, not a rolling boil.

A Bengaluru kitchen counter isn't a fridge

Most home kitchens in Bengaluru run without air conditioning, and a counter that sits at ambient room temperature most of the year gives ganache far longer to stay soft than the same batch would get in a chilled test kitchen. That's genuinely useful when you need extra working time to pipe a border or glaze a cake evenly. It's also a trap for anyone following a recipe's stated setting time literally, especially one written in a colder climate. A ganache that recipe would already call set can still be loose enough to slide off a cake an hour later on a Bengaluru counter, and the fix isn't more patience, it's the fridge.

Fixing a batch that has already split

The fix for heat damage isn't more cream. A split ganache already has too much fat relative to liquid, whatever the original ratio was, and pouring in more dairy fat deepens the same imbalance. The water method works instead: hot water added a teaspoon at a time, close to hand-hot, with hard whisking after each addition until the mixture turns glossy again. Water gives the existing fat room to redisperse into the surrounding syrup without adding more fat to a mixture that already has too much of it, and it works whether the original split came from a bad ratio or from too much heat.

Where this gets taught with hands on the bowl, not a recipe card

Doodles Baking Institute puts ganache balancing inside the chocolates module of its six-month advanced diploma, alongside French patisserie and cake artistry, rather than as a side note in a single cake-decorating class. Ratio and temperature control is the same underlying skill whether the ganache ends up piped into a bonbon shell or spread under fondant, and it's a skill most home bakers only pick up after breaking a few batches on their own first.

Frequently asked questions

Q: Can split ganache be fixed by adding more cream?

Not reliably. A split ganache already has too much fat relative to liquid, and cream adds more fat along with the little liquid it carries. Warm water, added gradually and whisked hard between additions, gives the existing fat room to redisperse without making the imbalance worse.

Q: Does the chocolate-to-cream ratio change between dark, milk and white chocolate?

Yes. Dark chocolate carries more cocoa butter and less sugar, so it can take more cream before the emulsion breaks. Milk and white chocolate carry more sugar and milk fat and less cocoa butter, so a ratio written for a dark ganache usually turns a white chocolate version too thin.

Q: Why does ganache that set fine yesterday split when I reheat it?

Reheating too fast, especially in a microwave without stirring between bursts, overheats the chocolate's fat unevenly. It clusters instead of melting smoothly back into the cream, which splits the emulsion even though the original ratio was never the problem.