Note that McDonalds was forced to add a few fasting items to their menu during Lent because the fasting practices in Greece actually hurt their sales that much
. Of course they had to appear as if they were being proactive rather than simply scrambling to keep their sales up, hence the tacky marketing campaign of McSarakosti ("sarakosti" is an abbreviated form of "tessarakosti" meaning "forty", what we call Lent here). I'm not particularly bothered by it since it is no different to all their other tacky marketing campaigns. During Holy Week, the vast majority of tavernas in Greece are closed as virtually no one eats meat that week. The only ones that stay open are the ones that have seafood on the menu.