Many will insist a proper Caipiriñha should be made with limao casca fina, limon de pica, or what you’d probably better know as Mexican or key lime. This type of lime – endemic in the Americas – is touted to be smaller and more fragrant than the Tahitian lime found in Australia, but once doused in a couple of ounces of Cachaça it’s unlikely anyone will be the wiser for your substitution.
