That's something of a challenge

So I've got twelve days and a budget of a pound to make something big happen. I'll be putting a one-night-only restaurant somewhere in Oxford with the intention of serving a lot of food to a lot of people. Step one on this mad adventure, however, is to do a one-lunchtime-only one this weekend. With food from Oxford's famous Covered Market, it's going to be one hell of a Sunday lunch...