Farro, the chewy, nutty-flavored grain that dates back to ancient Rome, has been turning up on upscale restaurant menus all over the city. It’s also great to have on hand in your pantry for a switch from pasta or rice. I recently used it as the base of this satisfying main-dish salad of roasted vegetables, herbs, and crumbled feta that’s destined to become a summer staple. I used the semi-pearled variety, which takes considerably less time to cook than whole farro, but is more nutritious than the even quicker-cooking pearled. To round out the meal, I served it with a simple salad of sliced cucumbers, tomatoes, and onions tossed in a little red wine vinegar, olive oil, and seasonings.