I've talked about passion fruit caipirinhas on the blog, as well as the various other fruits one can use. I forgot to mention in the latter post, but a focus group that we used to test caipirinhas made with lime, strawberry, passion fruit, kiwi, pine apple and persian lime concluded that Persian lime is the best fruit you can use. Persian lime is a bit larger than a “normal” lime (“key lime”), and is a less bitter. I've never seen Persian limes sold in US, the American readers are out of luck here.

That said, the Persian lime’s position at the top did not last long. Having returned from Brazil in August and unable to find Persian lime (or passion fruit for that matter), I resorted to trying raspberries. And the conclusion is: nothing beats a raspberry caipirinha.