Sugar – Why did the almonds burn instead of caramelizing

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.

First, I don't know where you people all get these gelatin-filled Turkish delight recipes. Turkish delight is made with starch, not gelatin (at least the recipes used in Turkey are all with refined starch or rice flour). What you are making here is jell-o (if you use small amounts of gelatin) or gummi bears (if you use lots of gelatin).

Second, about the taste. It is normal that fresh apple juice loses its taste when it is cooked. The normal Turkish delight tastes of sugar. Its aroma comes from strong aromas added to the liquid (rose essence, or artificial aroma). You don't preserve natural fruit tastes in Turkish delight. Even if you wanted to, I don't think there is a way to do it with apple juice. Some stronger tasting fruits (cherries, raspberries) could give a syrup with more taste, but are not part of traditional lokum.

Third, about the temperature. Your observation is correct, you are just evaporating the liquid. In some cases, it might be desirable to start with more liquid and evaporate, so you get more concentrated aroma - for example, if you have started with pure rose water. But if you are making a recipe which requires concentrated sugar syrup, it is OK to start with a ratio which creates saturated syrup at room temperature (3 parts sugar to 2 parts water) and cook until the desired consistency is reached (this is recognizable from the boiling point).

For most recipes however, you don't want a concentrated syrup. The candy hardness is defined by the amount of starch used. In this case, you just mix everything and you are ready after it has bubbled, just like any pudding. The amount of sugar seems to be 1 part sugar to 2 parts water.