A glossy ganache drip can make a simple buttercream cake look celebration-ready in minutes. A split, grainy or too-thin ganache, though, can turn cake decorating into a last-minute rescue mission. Knowing how to make chocolate ganache gives you one brilliantly useful mixture for drips, fillings, truffles, sharp cake edges and more.
The secret is not a complicated recipe. It is choosing the right chocolate, using the right cream-to-chocolate ratio, and letting temperature do the work. Once you understand those three things, you can make ganache to suit the finish you actually want.
What chocolate ganache is made from
Traditional chocolate ganache is simply chocolate and pouring cream. Warm cream melts finely chopped chocolate, then the mixture is stirred until smooth, shiny and fully combined. As it cools, the cocoa butter in the chocolate firms up, changing the ganache from pourable to spreadable and eventually firm.
That is why one batch can become a drip, a filling or truffles depending on the ratio and cooling time. It also explains why ganache is less forgiving than it looks. Chocolate can scorch, cream that is too hot can upset delicate white chocolate, and a ratio suited to dark chocolate will not necessarily work with milk or white chocolate.
For reliable results, use a good-quality cooking chocolate, couverture chocolate, melts or buttons made for baking and decorating. Compound chocolate can be useful for some projects, particularly in warm weather, but it behaves differently because it uses vegetable fat rather than cocoa butter. If you are after the classic flavour and silky finish, real chocolate is the best starting point.
How to make chocolate ganache step by step
For a standard dark chocolate ganache, start with equal weights of dark chocolate and pouring cream. For example, use 200 g dark chocolate and 200 g pouring cream. Weighing ingredients is much more reliable than measuring by cups, especially when you need a particular consistency for a cake.
Finely chop the chocolate and place it in a heatproof bowl. Smaller pieces melt evenly and reduce the temptation to overheat the mixture later. If you are using buttons or melts, they can usually go straight into the bowl.
Warm the cream in a small saucepan over low to medium heat until it is steaming and small bubbles appear around the edge. Do not let it reach a rolling boil. Pour it over the chocolate, making sure the chocolate is covered, then leave it untouched for two to three minutes.
Next, stir slowly from the centre of the bowl, working outwards in small circles. At first it may look streaky or as though it will never come together. Keep stirring gently rather than whisking vigorously. Soon, it should turn dark, glossy and smooth.
If a few pieces of chocolate remain unmelted, give the bowl very short bursts in the microwave at low power, stirring between each burst. Ten seconds can be enough. You can also sit the bowl over a saucepan of barely simmering water, ensuring the base of the bowl does not touch the water.
Cover the ganache with plastic wrap touching the surface if you are not using it immediately. This stops a skin forming while it cools.
The ratios that change everything
A 1:1 dark chocolate ganache is a great all-rounder. It works as a soft filling, a glaze or a drip once cooled to the right temperature. But cake decorating often calls for a more specific consistency.
For a firmer dark chocolate ganache that can be used beneath fondant or to create sharp edges, use roughly two parts chocolate to one part cream by weight. A 2:1 ratio, such as 400 g chocolate to 200 g cream, sets much firmer and is especially useful for tall cakes that need structure.
For a softer dark chocolate sauce or very fluid glaze, try two parts cream to one part chocolate. This is lovely over brownies, cheesecakes and ice cream, but it is too loose for most buttercream cake drips.
Milk and white chocolate contain more milk solids and sugar, with less cocoa mass, so they need more chocolate to reach the same firmness. As a practical starting point, use 2.5 parts milk chocolate to one part cream, or 3 parts white chocolate to one part cream. For example, 300 g white chocolate with 100 g cream makes a useful white chocolate ganache.
These are starting ratios, not unbreakable rules. Chocolate brands vary, room temperatures vary, and a cake sitting in an Adelaide summer kitchen will behave differently from one being decorated on a cool winter morning. Make a small test batch when trying a new brand or colour of chocolate.
Getting ganache right for a drip cake
The biggest drip-cake mistake is using ganache straight after making it. Fresh ganache is usually too warm and thin, so it runs all the way down the cake and pools at the base. Ganache that has cooled too far may sit on top in thick blobs rather than flowing over the edge.
For a dark chocolate drip, begin with a 1:1 ratio. Let it cool until it feels slightly warm rather than hot and flows from a spoon in a steady ribbon. The exact wait can be anywhere from 10 to 30 minutes, depending on your bowl, batch size and kitchen temperature.
Your cake should be well chilled with a firm buttercream finish. Test one drip at the back of the cake before committing to the front. If it races down the side, wait a few more minutes. If it barely moves, gently warm the ganache for a few seconds and stir well.
A squeeze bottle offers control, especially for beginners, but a spoon works beautifully too. Apply drips around the edge first, varying their length for a natural look, then fill in the top and spread gently. Add sprinkles, chocolate shards, edible glitter or a cake topper before the ganache completely sets so everything stays where it belongs.
Using ganache as a cake filling or under fondant
Ganache makes a rich, stable filling, but it should be cooled until spreadable before it goes between cake layers. Think peanut butter or soft butter rather than pouring sauce. A 1:1 dark chocolate ganache is delicious with vanilla, caramel, raspberry or coffee cakes, while white chocolate ganache works particularly well with citrus and berry flavours.
Pipe a buttercream dam around the edge of each layer before adding softer ganache filling. This simple border helps stop the filling escaping under the weight of the cake. If your ganache is very firm, let it sit at room temperature briefly or soften it in tiny microwave bursts.
For ganaching a cake before fondant, use a firmer 2:1 dark chocolate ratio. Apply it in a thin, even layer over a chilled cake, then use a scraper to smooth the sides. Chill briefly between coats if needed. Ganache creates a stable surface, but it is not magic - uneven cake layers and large gaps still need attention before you reach for the fondant.
Why ganache splits, goes grainy or turns too thick
A split ganache looks oily, dull or curdled. This usually happens when the mixture gets too hot, too much liquid is added too quickly, or the chocolate and cream have not emulsified properly. First, stop heating it. Let it cool for a few minutes, then stir gently from the centre. A tablespoon of warm cream, added gradually while stirring, can often bring it back together.
Graininess can come from overheating chocolate or using chocolate that has seized after contact with water. Keep utensils and bowls completely dry. If you are melting chocolate further in the microwave, use low power and very short bursts. Chocolate holds heat, so it can burn even when it does not look dramatically hot.
If your ganache is too thick, add warm cream a teaspoon at a time until it reaches the consistency you need. If it is too thin, the easiest fix is usually patience. Let it cool first, because warm ganache always appears looser. If it is still thin once cool, melt in extra chocolate a little at a time.
Small extras that add big flavour
Once you are comfortable with the basic method, ganache is easy to personalise. Add a pinch of salt to dark chocolate ganache for depth, or stir in a little vanilla, espresso powder, orange zest or a flavouring made for baking. Use concentrated flavours sparingly, as too much liquid can affect the texture.
For coloured white chocolate ganache, use oil-based or powdered food colouring. Water-based colours can cause chocolate to seize, leaving you with a thick, grainy mixture rather than the pastel drip you planned. If you are decorating for a birthday or themed event, make your ganache colour before testing the drip consistency, as colours and added ingredients can slightly alter how it flows.
Ganache keeps well covered in the fridge for several days. Bring it back towards room temperature before using, then stir until smooth. For a whipped ganache filling, chill it until firm but not solid, then beat it briefly until pale and fluffy. Do not overbeat, as it can become grainy.
The best part of ganache is that it rewards a little practice. Keep a note of the chocolate brand, ratio and room temperature that worked for your favourite drip or filling. The next time a cake needs a glossy finish in a hurry, you will have a dependable decorating skill ready to go - and one less thing to stress about before the candles are lit.
