Before you scrunch up your nose at the idea of raisins on a pizza (and I know you might be scrunching at this very moment), consider this: if I'd called this recipe "arugula salad with goat cheese, raisins, and walnuts", you'd be all for it. So why not put the whole thing on top of a piece of toasted flatbread, thick or thin, and warm it up so the cheese gets a bit soft and gooey? To make an easy and exciting pizza, combine any ingredients you'd ordinarily put in a salad bowl on a piece of pita bread, lavash, tortilla, or any of the wonderful variety of flatbreads you find in the supermarket these days. The secret is to add the arugula (you could also use spinach, watercress, or baby kale) after the pizza has cooked, or else it will wilt into a soggy mess. Toss your greens with a light vinaigrette or your favorite salad dressing, and pile them high on the pizza after it comes out of the oven. The contrast between warm pizza and cool arugula will win you over to the whole raisin thing. I promise.