This is a refreshing and crunchy salad that’s packed with flavor and texture. If you’re gluten-free, don’t be confused by buckwheat: it’s neither wheat nor a grain but actually a seed. Fiber-rich buckwheat groats or kasha are hulled, crushed kernels that can be cooked like rice or toasted in the oven to bring out its nutty flavors. Make a big batch and use it to top salads, soups, or roasted vegetables. Look for a head of celery with bright green leaves attached—they’ll add a whole other layer of flavor.