Science of Cooking: Fudge Recipe: What’s Going On? (2024)

Science of Cooking: Fudge Recipe: What’s Going On? (1)

What’s Going On?

• Why do I add corn syrup?
Corn syrup acts as an "interfering agent" in this and many other candy recipes. It contains long chains of glucose molecules that tend to keep the sucrose molecules in the candy syrup from crystallizing.

In fudge, the addition of "interfering agents" can be a double-edged sword: you want crystals to form, but not until the cooked mixture has cooled down to a certain degree.

• Why do I add vanilla?
Vanilla is often added to chocolate candies or other chocolate recipes because it complements and accents the flavor of chocolate.

• Why do I need to stop stirring after the syrup begins to boil?
At this point, you have dissolved the crystal structure of the sugar. Stirring or other agitation is one of the many factors that can encourage the fructose and glucose molecules in your syrup to rejoin and form sucrose—crystals of table sugar.

• Why do I wash down the sides of the pan?
The sugar crystals are dissolved at this point in the process. But a single seed crystal of sugar clinging to the side of the pan might fall in and encourage recrystallization.

• Why does the fudge need to cool for such a long time?
The key to a smooth and creamy texture is a fudge that's full of thousands of tiny sugar crystals.
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. A supersaturated solution is highly unstable, and any agitation will cause crystallization to occur throughout the solution. If fudge is stirred while it's still hot, fewer crystals form, and they grow larger as the syrup cools, resulting in a coarse, grainy candy.

• Why is it so important to keep stirring until the fudge "sets"?
Stirring helps control the size of the sugar crystals that form—it keeps them from growing too large, which would produce gritty fudge.

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Science of Cooking: Fudge Recipe: What’s Going On? (2024)

FAQs

What is the science behind making fudge? ›

Confectionery experiments have shown that the ideal cooking temperature for fudge is around 114 to 115 °C (237 to 239 °F). The cooking is intended to evaporate a part of the liquid and concentrate the sugar. The temperature of the cream/sugar mixture (called syrup) rises as water evaporates.

What is the secret to perfect fudge? ›

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.

What happens if you boil fudge too long? ›

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.

What is the process of making fudge? ›

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.

What is the secret to non-grainy fudge? ›

A lot of big crystals in fudge makes it grainy. By letting the fudge cool without stirring, you avoid creating seed crystals.

What makes fudge hard or soft? ›

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.

How do you make fudge creamy and not grainy? ›

Once the sugar has dissolved and the mixture has come to a boil, do not stir it. If you do, the sugar can crystallize, giving your fudge a gritty texture. As you beat the fudge, pay attention to color and texture. Once the fudge loses its sheen and thickens, put down your spoon.

What does cream of tartar do in fudge? ›

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 causes fudge to be too soft? ›

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.

What is the best temperature to cook fudge? ›

Place the sugar, milk, and corn syrup in a medium saucepan and stir well. Once the mixture begins to boil, stop stirring. Monitor the mixture and watch for it to reach 230ºF. Add the butter, chocolate, salt, and vanilla and bring the temperature up to 235ºF.

Why did my homemade fudge not harden? ›

The most common culprit behind unset fudge is inaccurate temperature control. If the sugar mixture hasn't reached the correct temperature, your fudge won't set. Ensure you use a reliable candy thermometer and follow temperature guidelines meticulously to achieve the desired consistency.

What is the softball test when making fudge? ›

making of fudge

termed in kitchen parlance the soft ball stage, that point between 234 and 240 °F (112 and 115 °C) at which a small ball of the candy dropped in ice water neither disintegrates nor flattens when picked up with the fingers.

Is evaporated milk or condensed milk better for fudge? ›

Evaporated milk doesn't have sugar added. The sweetened condended milk is needed as no extra sugar is added to the fudge. If evaporated milk were used then the fudge would not be sweet enough and also would still be too soft unless the fudge is frozen.

Do you stir fudge when it's boiling? ›

Stir the ingredients to dissolve the sugar until the mixture comes to a boil. If your recipe uses milk, stirring will keep the mixture from curdling. But once it reaches about 236–238 degrees F/113–114 degrees C (the "soft-ball" stage), do not stir it or even shake the pan.

How long should you leave fudge to set? ›

Swirl the chocolate through the mixture once using a spatula or the handle of a wooden spoon. Leave the fudge to set overnight.

How does fudge relate to chemistry? ›

The Science of Fudge: How Fudge Is Made

This technique helps prevent sucrose molecules from forming into a large crystal. Once cooled to 122° F, the syrup is stirred and scraped, forming many crystals at once. Continued stirring helps the sugar molecules spread among and bind to the crystal seeds.

Is making fudge considered baking? ›

Fudge is always a no-bake dessert and can be completely stove- and oven-free if you follow our method for how to make microwave fudge. That means it's a chocolate dessert idea that will keep your oven cool on even the steamiest days of summer.

What are the interfering agents in fudge? ›

Corn syrup acts as an "interfering agent" in this and many other candy recipes. It contains long chains of glucose molecules that tend to keep the sucrose molecules in the candy syrup from crystallizing.

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