One of the most common in stores is the Persian lime, a firm light green fruit that is slightly smaller than a typical lemon. Key lime (also called Mexican lime) and Kafir lime are also popular.
Lemon-lime seems pretty ho-hum as far as soda flavors go — so much so that this was the last of the 17 sodas I tried. However, I was surprised by how much I liked it. Unlike with any other lemon ...