From Jack Bishop's Italian Vegetarian Cookbook: a vegan caprese salad, with seasoned cannellini beans in place of mozzarella cheese. The beans require a little work (the recipe calls for dried cannellini beans to be soaked and then simmered with garlic and bay leaves) but can be prepared in advance. Once the beans have cooled, simply toss them with basil, diced tomatoes, olive oil, salt, and pepper -- very easy, and very refreshing.
Served with polenta and spinach.