Coverack Camping at Penmarth Farm does not show an on-site restaurant in its own facilities list. Its official site describes Coverack village as reachable from the campsite via Lovers Walk and lists nearby cafes, pub/restaurant/takeaway options, and Coverack Community Stores for groceries, so this should be treated as a nearby/external food route rather than on-site food service.
CampsiteCoverack Camping at Penmarth FarmCoverack, Cornwall, England