an acquired taste
US /ən əˌkwaɪərd ˈteɪst/
UK /ən əˌkwaɪərd ˈteɪst/

1.
something that you dislike at first, but that you learn to like after you have tried it a few times
:
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Olives are an acquired taste for many people.
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At first, I didn't like the strong flavor of blue cheese, but now it's an acquired taste.