Recipe Instructions:
olive oil, for greasing
1 pound (500 grams or 2 1/2 cups) sugar
1 pound (500 grams) whole almonds
1/2 lemon, optional
Grease a marble slab or piece of parchment paper with olive oil (marble is ideal, as it's heavy and won't move. Parchment, on the other hand, tends to slide—pull yourself a generous-sized piece and dampen the flat surface, such as kitchen counter, with a wet hand before placing the parchment down; this will help keep it in place).
Place the sugar in a wide, flat skillet in an even layer and turn the heat on low. Watch it carefully but don't touch it or stir it. As soon as it starts to melt, you can help it along with a gentle shake of the pan here and there, paying close attention that it doesn't become too dark (which means it will taste too bitter). It should be a medium or dark amber color, like maple syrup or a little darker, but it shouldn't go dark enough that it begins to look black!
When it begins to melt and you can see the caramel forming around the edges, you can give it a gentle stir with a wooden spoon to help it along. As soon as it has liquified completely and it is dark amber in color, tip in the almonds. The almonds will cool down the caramel and make it harder to work with (smaller nuts such as pine nuts or seeds such as sesame seeds are decidedly easier to work with), but don't lose focus! Keep it over the low heat and mix to combine until all the almonds are coated, then tip it out onto your prepared surface.
Now work quickly. I find the easiest way to flatten the top and reach the desired height (it should be the thickness of about 1/2 inch) is to place another oiled sheet of parchment face down on the top of the almond mixture and use a rolling pin to roll it to the right height. When doing this with smaller nuts, it's easy enough just to use the pressure in your hands (dampened with water) or a lemon half to push it out to the right size and height. If using the parchment and rolling pin, once you have reached the desired height, you can now rub the lemon half over the surface to add shine and a touch of flavor and to even out the brittle along the way. Let cool slightly. While the brittle is still warm, cut into pieces to serve (I find a large, heavy kitchen knife to be the best for this task). I like large bars for giving away as gifts, or small squares for serving with coffee at the end of a meal.
This makes a great edible gift: Wrap pieces individually in cellophane or parchment paper and tie with string. Keep any leftovers in an airtight container (preferably separated in layers with parchment paper to avoid sticking) and store in a cool, dark, dry place. Note that if you live in a warm, humid climate you might find this torrone is always a little bit sticky—nothing wrong with this (licking fingers is always a good thing if you ask me).