Usually, you see this drink with lemon, however as a result of that’s sharper, you must be extra even handed with it. Lime has tropical notes and a sweetness that I like. So I pull an extended shot or, if I’m shopping for it, I order a double shot. I throw that right into a pint glass stuffed with ice, high it with about 8 ounces of good-quality tonic, and squeeze a lime wedge into it. It’s so balanced: The nice and cozy espresso melts the ice, which waters the espresso down a bit, and the tonic’s sweetness with that bitter edge pulls out the tannins and the herbaceousness of the espresso, relying on what you’re consuming. A darkish roast will conflict with the tonic, so that you need one thing lighter, with berry or stone fruit notes.