Cuckoos Cafe in the old City near Lahore Fort is a must. You would need to try it during day light to see over the top of Lahore City and at night to see it all lit up. ** Make sure you sit on the roof!**
Village inn or is it the Village restaurant looks exquisite. i have never been in myself.
Gourmet Bakery is also quite good i think it near faisal town.