Opso

This trendy Marylebone eatery forgoes some of the more avantgarde inclinations of its now-defunct sibling, the two Michelin-starred Funky Gourmet in Athens, but retains some of the latter's panache. The menu features caviar, Wagyu and other upmarket items alongside traditional Greek delicacies, for example. They serve brunch on weekends, and there's an elegant private room you can hire if the main dining room with a communal marble table isn't what you're after. You can pair your meal with wine or cocktails.