How about swiss chard instead of lettuce (or spinach)? That stuff is hardy as hell--we had leaves coming up clear until the snow fell, and it lasts quite a long time, kept in a cool place (like your cold room!). Hell, you could freeze it, too! We have 2 beds at home and one at a local community garden, and we feed 6 people quite nicely from those, plus shopping farmer's market in season. This year was our first experiment with mass freezing: we found that corn isn't a good use of our limited space, but we bought a scad cheap and froze it in the seal-a-meal type bags (we've had the stupid machine for years--a gift from my mom--but never used it until this summer). Our green beans went nuts, too, so we froze those, too. We got all of the stuff for canning, but I'm still skittish--I've never done that before. Have you looked into urban foraging? We get raspberries from around a local pond (city owned, and they don't care if people pick the fruit), and apricots and pears from trees on a lot that has been abandoned for years. I've heard of other places around here, too. One thing I need to set my mind on is doing something with our grapes and plums. They are both delicious, but we grow WAY more than we can eat fresh, and the leftovers just go to waste.