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I've followed the recipe for an opera fudge (and several others) as close as I can, yet my fudge always turns out grainy and crumbly. The best results I've gotten have come from not washing down the sides of the pan, but transferring the mixture to a new pan instead.

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In Scotland we make a kind of fudge that is deliberatly hard and crystallised known as Tablet. This was a popular treat when I was growing up. Essencially the recipe for tablet, soft fudge, toffee and caramel are quite similar. The difference is made by how you cook and treat the mix as it cools.

Essentially you need to know about sugar boiling points. There are two important levels used: soft boil, and hard boil. My cook books suggest using a sugar thermometer to get the perfect boil but I've never found a sugar thermometer in the shops. Instead I rely on a great deal of practice, the colour, the texture and the drip of the mix to gage how hot the sugar is.

In a soft ball (234–240 °F or 112–115 °C), if you drip the mix onto a very cold surface or into cold water, then touch the drip with your finger, it will be soft like caramel. Additionally the colour will change from cream to yellow/tan.

In a hard ball (250–266 °F or 121–130 °C), dripping again onto a cold surface or into cold water, then touching the drip with your finger, it will be firmer or even hard. The colour will darken slightly to a dark yellow or light brown.

For caramel and fudge you go to a soft boil then cool. For tablet and toffee you go to a hard boil.

The next part is the cooling. This is equally important as the boiling. The faster you cool the mix the smaller the crystals become. The slower, the larger. If you want a caramel or a toffee, you must avoid agitating the mix as it cools. For fudge you should stir the gently as it cools slightly before pouring onto the try. For tablet, the mix should be vigorously stirred until stiff then poured onto a try.

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  • I think in my latest batch that I might have gone to too high of a temperature. I also noticed that I went from a boil to 234 degrees really fast. I've read that the speed at which the mixture comes up to temperature is important. Is this true?
    – basilard99
    Commented Aug 11, 2011 at 14:25
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    Yes, the speed that you raise and also lower the temperature is critical in getting the correct texture. If the temperature rises to fast it can also affect colour and flavour. There is always a risk, when going for a hard boil, to burn the mix an ruin the batch. Generally I want to use a low head and bring the mix gently to a boil then slowly increase the temperature. As you do this you are also boiling of more water and that affects things.
    – Rincewind42
    Commented Aug 11, 2011 at 14:37
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Be patient and do not stir fudge during cooking, only drag wooden spoon across bottom of pan. Remove from heat at 236-238 degrees fahrenheit, or soft ball stage. Drop in butter and let cool without stirring to 110 degree fahrenheit. Very important to let the fudge cool and rest before beating.

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What you're seeing is crystalization. Fudge is such a picky animal. Here is a site called the Science of Cooking that walks through exactly how to avoid grainy fudge:

http://www.exploratorium.edu/cooking/candy/recipe-fudge.html#

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    I agree that this is crystallisation. But you shouldn't just give a link with a recipe/technique suggestion, because you don't know whether it will be online tomorrow. You are supposed to summarise the parts about preventing improper crystallisation and list them in your answer, while keeping the link for credit.
    – rumtscho ♦
    Commented Aug 11, 2011 at 5:57

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