Sorry to sound flaky, but, when adding lemon to the varonka is it to be sliced, wedged or just the peel?
I agree that hrebicek is clove as i was curious about what a rose apple is (and i wanted to avoid doing anything useful ) i did a bit of research: rose apple is Syzygium jambos http://www.tradewindsfruit.com/rose_apple.htm while the clove is Syzygium aromaticum http://www.tradewindsfruit.com/clove.htm from the looks of it all Syzygia all called hřebíčkovec in czech (the one for cloves being called hrebickovec vonny) thus leading to the odd translation of hřebíček=rose apple in some sources