Toasted Farro and Apple Salad with Mustard Vinaigrette

Farro, a type of wheat, has a satisfyingly tender-chewy texture and a nutty flavor that’s accentuated by toasting the grains before they’re simmered. This autumnal salad matches toothsome farro with tangy-sweet apple, crisp celery and pungent onion that’s mellowed by briefly steeping it in the mustard vinaigrette. Be sure the farro is still warm when it’s dressed. As it cools, the grains absorb flavor. The salad is delicious served cold or at room temperature.