just cup of tea
just (one's) cup of tea
Precisely that which one prefers, desires, enjoys, or cares about. I've never enjoyed boring intellectual dramas, but a gore-filled monster movie? Now that's just my cup of tea. It sounds pretty boring to me, but postmodern literature is just Mary's cup of tea, so I bet she'd be interested in going with you.
just one's cup of tea
Fig. to be something that one prefers or desires. til This spy novel is just my cup of tea. Teaching children to read is just my cup of tea.