I have just returned form Lone Pine and at 11:00 PM the High Sierra Cafe is the greatest thing on earth. It is also the only 24 hour restaurant in Lone Pine. I have also eaten at the Mt. Whitney Restaurant, my hiking buddies like it over the rest, for a diner. The Pizza Factory is just that good food, maybe a room for your group (I’m not sure). For a nice dinner I have eaten at the Totem Café, they have taken good care of me, by myself or in a group. These are the ones I have tried and liked.
There are other places to eat at, some I want to try some day.
There is all ways fast food but you have that at home, I’m sure.
Try:
http://www.395.com/index.shtml?dining