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I'm preparing to make pumpkin seed brittle, and I notice the recipe is very similar to the peanut brittle recipe I used before. Unfortunately, it turned out awful! The sugar never quite turned "light amber" even after almost an hour, and eventually I noticed it start to crystallize. I tried pouring it anyway and ended up with basically a clear sheet of sugar that dissolved into crystals when broken (I left off the nuts because I was pretty sure it was ruined - the nuts tossed in spices made a lovely alternate snack instead). I notice several comments having similar issues, but also many more saying "It worked perfectly the first time!" What did I do wrong? Should I use a different recipe? Is there some way to make this more foolproof? One of my friends started babbling about "invert syrup" being the cure for my ills...

Recipe is at http://www.foodnetwork.com/recipes/alton-brown/peanut-brittle-recipe/index.html . My attempt was done in spring in Manchester, UK, so while it may have been a bit damp, there wasn't likely to be a ton of humidity and no altitude problems.

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You didn't heat it enough. "Turning light amber" means that you want caramel. What you did instead was to evaporate water from a sugar syrup, without reaching caramelization temperature. The crystals are not unusual (at some point you get a supersaturated syrup, after enough water has evaporated), but it is better if they don't happen, so don't give them occasion (use a clean pot, don't stir, etc. I suspect the oiling of the pan is meant to reduce nucleation sites).

The recipe is a bit strange anyway, using way too much water. Maybe you can try another one, if this has negative comments. The regular recipes will use some more conventional nut instead of pumpkin seeds, but this doesn't affect the physics of making the caramel. And do yourself a favor and use a candy thermometer. There are experienced cooks who can make sugar candy without one, but if you are not one of them, you'll save yourself lots of errors (and probably enough money in expensive ingredients for the thermometer to pay for itself).

Here is another recipe for brittle. While I haven't tried to make it, I strongly suspect that they know better what they are doing - not at least because they give you the exact temperatures you are aiming for. This is a site with lots of useful tips for candy making, and if you really want to try this without a thermometer, use their chart to learn about the different stages of sugar syrup and caramel.

And choose your recipes carefully. Candymaking (both sugar and chocolate) is even more exact than baking. Directions like "put back on medium for some time" are practically useless. In order to successfully cook a candy recipe, you have to know if not the exact temperature, then at least the desired sugar syrup stage. Maybe somebody who has made lots of brittles could work with a recipe like the foodnetwork one, noticing the problems on the fly and making the appropriate corrections towards the ideal brittle mass. If you don't know what the ideal brittle mass looks like before you start, it is better not to try it that way and go for an exact recipe.

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Thanks! I've never had Alton Brown fail me before :/ His pumpkin seed brittle recipe appears identical to the peanut brittle recipe except for the substitution of nuts, so I suspect I can use that recipe + his seasoning on the nuts + pumpkin seeds rather than peanuts. I do have a candy thermometer - bought one after the brittle fiasco. –  Yamikuronue Oct 31 '11 at 15:44
    
Agreed - Alton Brown's recipes are usually quite good. From the comments, it seems like people had very variable success - some perfect, some awful. Some of them suggest that you need to watch the video (i.e. some details got left out in the transcription). In particular, the video says to stop at light amber or 350F. It seems likely that it does work... if you actually manage to do what he did. –  Jefromi Oct 31 '11 at 21:28

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