I've been in Turkey during Ramadam with my muslim Turkish partner, and we have had many a long, leisurely lunch sat outside a seafront restaurant - with a couple of beers and glasses of wine to wash it down.
Not all Turkish people fast for Ramadam anyway! And those that do still need to work, irrespective of their religious beliefs. They are not so radical as to expect Christian holidaymakers to go without lunch on account of their own religion - that would be very foolish and bad for business.
Turkish people are usually very accommodating and pleasant, and will go out of their way to make a tourist feel welcome. They will also want them to dine in their restaurants at lunchtime.
You really wouldn't realise Ramadam was on - everything is still exactly the same for the tourist (and for many muslims' too).
Strawberry