For vegetarians, such protein powerhouses as legumes—beans and lentils—and nuts are the foundation of an all-veg menu, for these foods contain not only protein, good carbs, fiber, and micronutrients, they also, in the case of nuts, add some good-for-you fats. And for ease of cooking, these can’t be beat. Almost every legume comes precooked in a can, and nuts are sold roasted and shelled ready for the breakfast, lunch, or dinner plate.