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

What’s special about fudge?

Science of Candy: What's Special About Fudge? | Exploratorium (1) 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.

While you ultimately want crystals to form, it's important that they don't form too early. The key to successful, nongrainy fudge is in the cooling, not the cooking. The recipe calls for heating the ingredients to the soft-ball stage, or 234° F, then allowing it to cool undisturbed to approximately 110° F. If you stir during this cooling phase, you increase the likelihood that seed crystals will form too soon.

Science of Candy: What's Special About Fudge? | Exploratorium (2) A seed crystal is a surface that sucrose molecules (that's the sugar) can begin to attach themselves to—it could be a few sucrose molecules stuck together, a piece of dust, or even a little air bubble. Once a seed crystal forms, it grows bigger and bigger as the fudge cools. A lot of big crystals in fudge makes it grainy.

By letting the fudge cool without stirring, you avoid creating seed crystals. Stirring would help sucrose molecules "find" one another and start forming crystals. Stirring also introduces air, dust, and small dried bits from the walls of the saucepan—all potential seeds for crystal formation.

When the fudge has cooled to about 110° F, you want to start the crystallization process. You start to stir, and keep stirring, until the candy becomes thick. The more you stir, the more crystal seeds you get. But instead of getting a few huge crystals (and grainy candy), you get lots and lots of tiny crystals, which make for thick, smooth candy.

There are two other candies that deliberately employ sugar crystals. One is fondant, a wetter version of fudge that you find inside soft-center chocolates. The other is rock candy, for which a sugar solution is left for days to form enormous crystals.

Think you get it? Try making fudge or rock candy yourself!

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.

Why is fudge so good? ›

Between its deeply rich flavor and its silky texture, fudge makes a brilliant treat to pair with coffee. The sweet and bitter flavors complement one another perfectly, making for an unstoppable combination.

What is the secret to good fudge? ›

You have to control two temperatures to make successful fudge: the cooking temperature AND the temperature at which the mixture cools before stirring to make it crystallize. Confectionery experiments have shown that the ideal cooking temperature for fudge is around 114 to 115 °C (237 to 239 °F).

What are the characteristics of fudge? ›

Characterised by its smooth, creamy texture and decadent flavour, fudge is typically made from a mixture of sugar, butter, and milk or cream. The ingredients are heated to the soft-ball stage, around 235-245°F (113-118°C), and then beaten while cooling, which gives fudge its characteristic smooth and dense texture.

Why does fudge have so much sugar? ›

Fudge is made up mostly of sugar and cream (condensed milk or evaporated milk are sometimes used instead). Most recipes use double the amount of sugar to cream. Keep in mind that during the boiling process we want to prevent crystals from forming in the mixture so that our fudge doesn't turn out 'sandy'.

What makes fudge special? ›

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.

What makes fudge different from chocolate? ›

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.

How do you describe high quality fudge? ›

High-quality fudge tastes smooth and creamy because it contains small sugar crystals. It has a deep brown color and a satiny sheen. Poor-quality fudge tastes grainy because it contains large sugar crystals.

Should fudge be hard or soft? ›

Even without a candy thermometer, you can still check if the fudge is cooked by doing a cold water test. Drop a piece of hot fudge into a glass filled with ice water. It should form a soft ball that can easily flatten between your fingers.

What is real fudge made of? ›

At its simplest, fudge is a dense, soft candy, often made with sugar and dairy products like butter and milk. Nowadays, fudge is usually flavored with chocolate, but you can utilize pretty much any flavor, such as peanut butter, pumpkin, even birthday cake.

What is fudge explained? ›

fudge, creamy candy made with butter, sugar, milk, and usually chocolate, cooked together and beaten to a soft, smooth texture. Fudge may be thought of as having a consistency harder than that of fondant and softer than that of hard chocolate.

What is fudge technically? ›

Fudge is a type of confection that is made by mixing sugar, butter and milk. It has its origins in the 19th century United States, and was popular in the women's colleges of the time.

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.

Can diabetics eat fudge? ›

According to the American Diabetes Association, people with diabetes can still have sweets, chocolate, or other sugary foods as long they are eaten as part of a healthful meal plan or combined with exercise. They consider a healthful meal plan to: have limited saturated fat. contain moderate amounts of salt and sugar.

Is fudge very unhealthy? ›

Whether it's chocolate, nut-filled or even swirled with peanut butter, fudge is a holiday favorite. But clocking in at around 130 calories and 5 grams of fat per ounce, this rich treat is far from a healthy choice. ... Fudge also boasts very little in terms of health.

Why did my fudge turn out like taffy? ›

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).

Is fudge super unhealthy? ›

Whether it's chocolate, nut-filled or even swirled with peanut butter, fudge is a holiday favorite. But clocking in at around 130 calories and 5 grams of fat per ounce, this rich treat is far from a healthy choice. ... Fudge also boasts very little in terms of health.

What is benefit of fudge? ›

Dark chocolate fudge is not just a treat for the taste buds; it's a mood elevator. The rich cocoa content stimulates the production of endorphins, the 'feel-good' hormones, in the brain. Additionally, it contains serotonin precursors that can enhance your mood and alleviate stress.

Where is the world's best fudge? ›

While fudge was not invented on Mackinac Island, it most certainly – and most deliciously – was perfected here.

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