I made this marinated mozzarella with tomato as a starter yesterday and it was a really striking looking dish and very tasty. The recipe is by Yotam Ottolenghi Marinated buffalo mozzarella and tomato from his vegetarian cookbook Plenty (p. 126-127). It can also be found online here. It's a simple and fine dish like Ottolenghi says.
I followed Ottolenghi's recipe otherwise, but scaled it down by the half, as there were only two eaters. The dish was exquisit: lemony, garlicky mozzarella with a punch of qualitative olive oil and a flavour of the fennel seeds going through accompanied by tasty local tomatoes. I will definitely serve this as a starter at a future dinner party and can only recommend it.