Grain salads always hold up well, so they’re perfect for picnics, potlucks and making ahead for lunch the next day. This one stars chewy farro, enhanced with red onion, arugula and slices of ripe stone fruit, whatever kind you have (red plums are especially pretty added to the mix). The tangy grains are then spooned around a ball of burrata, which adds a mild, creamy contrast. Serve this as a meatless main course or a hearty, colorful side dish.