juice of 1/2 lime (and extra slices for garnish)
1-2 Tbsp sugar
5-6 sprigs of cilantro (or more if you love it!)
Squeeze the lime juice into a glass. Add the cilantro and sugar and use a muddler or spoon to crush the cilantro leaves. Fill glass with ice, then top off with seltzer. Stir to combine and add extra sugar if necessary.
Mine was kid-friendly, but you can also top the ice with a shot of vodka or gin before adding the seltzer.
I like the idea of using herbs in drinks like this (the lavender lemonade we made a few years ago was really tasty, too). What's your favorite summer drink?