Think of this recipe as a model or basic risotto recipe. You can vary it in many ways, substituting other vegetables, alone or in combination, depending on the season: in spring, freshly shelled green peas or fava beans; in summer, peeled and seeded red-ripe tomatoes, zucchini, or sweet peppers roasted and peeled; or in autumn, fresh fennel or chunks of butternut squash. Recipe courtesy of Nancy Harmon Jenkins, The New Mediterranean Diet Cookbook, Bantam Books.