Science of Candy: What's Special About Fudge? | Exploratorium (2024)

FAQs

Science of Candy: What's Special About Fudge? | Exploratorium? ›

Fudge is one of the rare exceptions to the rule that sugar crystals are not desirable in candy. Tiny microcrystals in fudge are what give it its firm texture. The crystals are small enough, however, that they don't feel grainy on your tongue, but smooth.

When making fudge, heat and acid work together to convert sucrose – basic white sugar – into its two components, glucose and fructose. When these sugars are present, they prevent sucrose from turning into big sugar crystals.

Although fudge often contains chocolate, fudge is not the same as chocolate. Chocolate is a mix of cocoa solids, cocoa butter and sometimes sugar and other flavorings and is hard and brittle. Fudge is a mixture of sugar, dairy and flavorings that is cooked and cooled to form a smooth, semi-soft confection.

Heating the sugar and milk mixture allows the milk to dissolve more and more sugar, and by the time the mixture is boiling, all the sugar is dissolved. The general principle is that at a particular temperature, a given solvent (in this case, milk) can dissolve only so much of a particular solute (sugar).

Brush the sides of the pan with a wet brush at the beginning of cooking to dissolve sugar crystals stuck to the sides. Never stir the mixture during cooking or sugar could crystallize again. The mixture may seize and become grainy. Use a candy thermometer or conduct a cold water test to check if the fudge is done.

Fudge is one of the rare exceptions to the rule that sugar crystals are not desirable in candy. Tiny microcrystals in fudge are what give it its firm texture.

Don't stir!

Once the fudge reaches soft-ball stage on the candy thermometer, remove from the heat and let the temperature drop to 110°F. Keep that spoon or spatula out of the pot until this happens. If you stir too early in the process, you'll make the sugar crystals too big and end up with grainy fudge.

Fudge typically contains more sugar than chocolate, so it may not be the best choice for those looking to limit their sugar intake. On the other hand, dark chocolate is a good source of antioxidants and can provide health benefits when consumed in moderation.

The exact origin and inventor of this delicious confection are hotly debated. However, many believe the first batch of fudge was created by accident when American bakers “fudged” a batch of caramels. Hence the name “fudge.”

Fudge incorporates sugar, milk, butter, and other ingredients such as cocoa for chocolate fudge. The chocolatier then heats these products together until they melt. After this, the mixture is beaten during the cooling process. Think of fudge as a food consisting of crystallized sugar.

What do Americans call fudge? ›

Fudge is a rich, chocolate candy made with plenty of sugar, cream, and butter. Fudge is usually cut into squares and eaten in small quantities. While fudge comes in many different flavors, it's usually chocolate. In the US, another kind of fudge is smooth, melted chocolate that can be poured over the top of ice cream.

Too cooked

This fudge was cooked to a temperature of 118 °C (244 °F). At this temperature, the sugar is too concentrated and there is not enough water left to form syrup around sugar crystals. The result is hard and brittle fudge. To save the fudge, put it in a saucepan with 45 to 60 ml (3 or 4 tbsp.)

Cream of tartar is used in caramel sauces and fudge to help prevent the sugar from crystallizing while cooking. It also prevents cooling sugars from forming brittle crystals, this is why it's the secret ingredient in snickerdoodles!

If the fudge is very soft and slightly chewy then it is possible that it did not quite cook to soft ball stage and next time the mixture should be cooked to a slightly higher temperature (soft ball is 112-116c/235-240F and a sugar or candy thermometer can help).

The amount of time you cook fudge directly affects its firmness. Too little time and the water won't evaporate, causing the fudge to be soft. Conversely, cook it too long and fudge won't contain enough water, making it hard with a dry, crumbly texture.

If the butter gets too hot, it can separate, causing the fudge to become oily on top. This is easy to prevent by monitoring the temperature with a candy thermometer, but separated fudge can also be fixed. To fix oily, hard or grainy fudge, scoop the fudge back into a pot with about a cup of water.

If you don't heat your fudge to a high enough temperature, you'll end up with a soft product. And if you heat the mixture too much, your fudge may be harder than you'd like.

There are two main reasons. First, we use ingredients not prone to melting. Specifically, we use heavy cream instead of butter. Second, we slice our fudge while still warm so that each slice forms a firm outer shell.

Traditional "fudge" gets its structure primarily from the sugar, which forms fine crystals; the texture of fudge is a stiff suspension of the sugar in the fat. So simply reducing the proportion of sugar will mess up the texture, as GdD alluded to.