Lunch between Cambria and Big Sur?
You should probably plan to stop in either Cambria or Big Sur, instead of somewhere in between. There have been a lot of recent threads with suggestions in both places. If you can make it there, I'd probably suggest Nepenthe in Big Sur. Even if you're driving through, don't miss the Julia Pfeiffer Burns waterfall overlook - there's a nice spot for a picnic there just a short walk from the highway.