A deli sandwich

I'm allergic to olive oil (which can be a pain when it comes to eating out) and so use walnut oil where olive is called for. Nigel uses loads of it in this sandwich (as well as olives, which, naturally, I can't eat either) but I've run out so, rather than drizzling with oil, I spread leftover home made pesto on the bread. It really works and makes me feel a bit more domestic goddessy! Delicious lunch.