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.

The key to creamy, luscious fudge is controlling crystal formation. If the sucrose (table sugar) crystals are small, the fudge will feel creamy and smooth on your tongue. But if the crystals are large, the fudge develops a crumbly, dry, or even coarse texture.

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.

Sugar Crystals Formed

It's important to beat the fudge ingredients to develop the right texture, but you won't get smooth, creamy fudge if you beat it when it's too hot. Beating fudge when it's still over heat creates sugar crystals, aka the grittiness you feel in the fudge.

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.

fudge noun (AVOID)

to avoid making a decision or giving a clear answer about something: fudge the issue The government continues to fudge the issue by refusing to give exact figures.

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).

If there is too much evaporation, when the cooking time is too long, there will not be enough water left in the fudge and it will be too hard. Conversely, if the cooking time is too brief and there is not enough evaporation, too much water will remain and the fudge will be too soft.

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!

What is the principle of fudge? ›

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).

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.

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.

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).

Fudge is very high in sugar, and that can give you a tummy ache and worse as the sugar floods your body.

However, homemade fudge doesn't always set up into a semi-firm, melt-in-your-mouth confection. If your fudge doesn't firm up after a few hours, you either have too high an amount of liquid to sugar, or your mixture hasn't reached the soft-ball stage. Using a candy thermometer can help home cooks avoid this problem.

Commercial fudges are generally prepared by mixing milk, corn syrup (glucose), sugar, fat, a little salt, and suitable flavoring matter such as chocolate; cooking the resulting mixture to a temperature of about 235 F. to 245 F., while agitating the mix; cooling the mix to a temperature between 90 F.

Beating the mixture encourages the formation of small sugar crystals, which leads to the crumbly texture. The crystals may not be noticeable in themselves but the fudge mixture will thicken and turn from shiny to matte in appearance.

Heating the syrup to a high temperature and then allowing it to cool, undisturbed, produces a supersaturated solution—this means that the solution contains more sugar molecules than would normally be possible at room temperature.