Around the holidays, we're never quite sure who will drop in, or when, or how long they might stay. One thing we do know is that everyone must be fed, and fed in holiday style. Vegetarians and vegans merit special attention in our household, because there are so many of them, and I always have a batch of this vegan black bean and sweet potato stew made ahead and stashed in the freezer. Like all stews, this one tastes better when made a bit ahead, and the slow cooker does most of the work, so it's perfect for holiday entertaining. The vibrant colors and bright citrus-accented flavors appeal to all ages, and make this stew a great side dish or main course. I like to serve it with wedges of polenta, but it would be great over rice or noodles, too.