Sausages with Orange, Olive, and Sweet Onion Relish

Heat a grill, grill pan, or skillet to medium-high heat. Coat the sausages with 1 tablespoon oil and cook, covered, turning occasionally, until just cooked through, 12 to 15 minutes. Meanwhile, cut away the peel and white pith of each orange. Working over a bowl, cut the orange into segments, the bowl will catch any juices. Cut the segments into 1/2 inch pieces. Add the onion, olives, parsley, remaining tablespoon oil, and a pinch each salt and pepper to the bowl and gently toss to combine. Serve the sausages in the rolls and top with the relish.