How to Fix Seized Chocolate

One moment the chocolate is melting into a glossy pool; the next it tightens into a dull, stiff, gritty lump. That is seizing. It happens fast and usually catches bakers by surprise because the cause is so small: a drop of water from a wet spoon, a puff of steam from the double boiler, or a few seconds too many in the microwave.

There are two kinds of seized chocolate, and only one is fully recoverable. Chocolate that seized from a little moisture can be turned into a smooth sauce or ganache with more liquid. Chocolate that seized because it overheated and scorched can sometimes be rescued if caught early, but burnt flavor cannot be removed.

Why chocolate seizes

Chocolate is fine particles of sugar and cocoa solids suspended in fat. Those particles stay separate as long as there is no water around. A small amount of water dissolves the sugar on the surface of each particle and glues them together into clumps, which is why the chocolate suddenly thickens and turns grainy.

The surprising part is that more water fixes it. Once there is enough liquid to fully dissolve the sugar and surround all the particles, the mixture becomes smooth and pourable again. That is why ganache works: the chocolate goes into a large amount of cream, not a splash.

Rescuing water-seized chocolate

Add boiling water, hot cream or hot milk, about 1 tsp at a time, stirring vigorously after each addition. A rough guide is 1 tbsp of liquid per 170 g (6 oz) of chocolate, though you may need a little more. The chocolate should loosen and turn glossy again.

The result is smooth, but it now contains liquid and will not set hard or snap. Use it in brownie or cake batter, as a hot fudge sauce, in a mousse base or as a ganache. If you are using it in a recipe, account for the small amount of extra liquid.

• Hot water: neutral flavor, thinner result
• Hot cream: richer, works as a quick ganache
• A neutral oil or melted shortening: softer, keeps more shine

When overheating is the cause

Chocolate that has been heated too hard turns thick, dull and crumbly, and may smell toasted. Dark chocolate is fairly forgiving, but milk and white chocolate contain milk solids that scorch at lower temperatures. As a guide, keep dark chocolate below about 50°C (120°F) and milk and white chocolate below about 45°C (113°F) while melting.

If the chocolate is thick but tastes fine, take it off the heat immediately and stir in a few pieces of unmelted chopped chocolate to cool it down, then add a teaspoon of neutral oil if needed. If it tastes burnt, bitter or acrid, it has scorched. Discard it, because the flavor will carry through anything you make.

Melting chocolate without seizing it

Chop the chocolate into small, even pieces and make sure every bowl, spatula and thermometer is completely dry. In a double boiler, keep the water barely simmering and the bowl above, not touching, the water. Turn off the heat once the water is hot and let the steam's gentle warmth melt the chocolate.

In the microwave, use 50 percent power in 20 to 30 second bursts, stirring each time, and stop while a few lumps remain; stirring will melt them. Never cover the bowl with a lid, which traps condensation that can drip back in.

• Dry everything first
• Low, indirect heat only
• Stop heating before the last lumps melt
• No lids or covers while melting

Adding liquids to chocolate on purpose

Many recipes combine chocolate with liquids such as butter, cream, coffee or liqueur. The safe approach is to melt them together from the start, or to add warm liquid all at once rather than in drips. Cold liquids, and small splashes, are the ones that cause seizing.

Melted butter is mostly fat and blends easily with chocolate, which is why brownie recipes often melt the two together. Vanilla extract and liqueurs contain water and alcohol, so stir them in after the chocolate has been combined with the other liquid ingredients.

Common questions

Can I temper chocolate that has seized?

No. Once water has been added to fix a seize, the chocolate cannot crystallize properly into a snappy, glossy coating. Save it for sauce or batter and use fresh chocolate for tempering.

Why did my white chocolate turn grainy in the microwave?

White chocolate scorches easily because it is mostly sugar, milk solids and cocoa butter. Use 50 percent power or less, short bursts and frequent stirring, and stop while some pieces are still solid.

Does chocolate chip or bar chocolate matter?

Chocolate chips contain less cocoa butter and sometimes stabilizers so they hold their shape in cookies, which also makes them melt thicker and seize more readily. Chopped bar chocolate melts more smoothly.