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

FAQs

What is the science behind making fudge? ›

Cooking is necessary to dissolve sugar crystals and to evaporate part of the water in the cream. The length of this step has a direct impact on the firmness of the fudge. As water gradually evaporates, sugar is concentrated and the temperature of the mixture rises above 100°C (212°F).

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.

Fudge usually behaves this way when it's not cooked to a high enough temperature (due to oversight or a faulty candy thermometer). If your fudge is tough, hard, or grainy, then you may have made one of several mistakes: You may have overcooked it, beaten it too long, or neglected to cool it to the proper temperature.

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).

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.

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.

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!

​Harden the fudge:​ Place your container or tins in the fridge for 2 hours, which is the time it takes for the fudge to set. Once it's hardened, cut the fudge into 12 pieces or remove it from the muffin tins. Store in the fridge or the freezer (if you don't devour it right away).

It's usually made on the stove with sugar, butter, and milk. There are many varieties of fudge, but the most popular type is chocolate. This simplified version comes together quickly in the microwave with just chocolate chips, sweetened condensed milk, and butter.

Why won't my condensed milk fudge set? ›

If you didn't reach the correct temperature during the cooking process, it might not set properly. Use a candy thermometer to ensure that you reach the recommended temperature. Overcooking or Undercooking:Solution: Cooking the fudge for too long or too short a time can affect its texture.

You should mix the cream, butter, and sugar when making your fudge, but put down the spoon once it has reached its boiling point. Stirring while your sugar mixture is boiling will only form sugar crystals and make your fudge crunchy rather than silky smooth.

If it's overcooked (resulting in grainy fudge) or undercooked (resulting in poor setting) all you really need to do is add a bit of cream, reheat the fudge to the target temperature, and let it set again.

However, if you don't beat it at all, the crystals won't form properly, so your fudge won't set. If you forget to beat the fudge, try heating it back up over low heat, then beat it once it's slightly softened. If you beat the fudge too soon, the crystals will be too large, and the fudge will be grainy.

Small sugar crystals give you a smooth melt in the mouth texture. The secret to smooth fudge is to let the sugar syrup cool undisturbed until it reaches about 110°F and then beat it until no longer shiny.

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.

According to most recipes, the ingredients of fudge are cooked to what is 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.

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.