A plant-based Thanksgiving dinner can still be just as celebratory and satisfying as one with dairy and meat. The proof is this colorful, delicious dinner. It starts with a smooth, puréed sweet potato and celery root soup. Next move on to a vegetable tart on a flaky crust, spotlighting the season’s best produce. The main event is a Harvest Grain Salad Bowl, a riot of colors and textures. Finish with a sweetly spiced carrot bundt cake with a vegan cream cheese glaze.