We had a two-hour layover in Koln. We weren't very hungry but didn't want to eat "train food." If Koln Cathedral is at your back, turn left onto the main drag. There is a bakery, Merzenich, where you can get quiche, sandwiches and pastries. We got quiche to take away and ate at the Roman Arch park in front of the Cathedral. €2.50 for quiche, sandwiches €2-3.
We visited there as a day trip from St.Goar in 2008. If you get back to Koln, a tour of the Cathedral or even just the self audio guide is worth the cost.
Great tip, thanks. I added it to my file.
Yep, did the Cathedral first thing. Just didn't want to join the THRONGS at the cafés. It was busy and hot. We found a picnic more to our liking that day.