I have come across more than one version of "pesto Trapanese", the Sicilian pasta sauce from Trapani that differs from the more popularly known Genoese variety in a number of ways. Chief of these is that almonds, not pine nuts, are ground into the mix - a divergence whose origins (in common with a lot of Sicilian food) owe much to Arabic cooking.
I like to use fusilli lunghi, which are like long golden ringlets (or, less poetically, telephone cords) but, if you can't find them, simply substitute regulation-size fusilli (or indeed any pasta of your choice).
Since the sauce is unheated, it would be wise to warm the serving bowl first but, having said that, I absolutely adore eating this Sicilian pasta cold, should any be left over. It is so easy to make and, being both simple and spectacular, is first on my list for a pasta dish to serve when you have people round.
Recipe posted by Nigella