F&W's Grace Parisi makes this soda with iSi's new Twist'n Sparkle soda maker, which carbonates beverages in less than 30 seconds. $50; williams-sonoma.com More Nonalcoholic Drinks
In a medium saucepan, simmer 1 cup water with sugar until the sugar is dissolved. Add basil and mint leaves and let steep for 1 hour.
Strain and discard the herbs. Let the syrup cool completely. Stir 4 cups cold water and fresh lime juice into the syrup.
Make the soda according to the manufacturers' directions. Serve in tall glasses over ice.
The recipe can be prepared through Step 2; refrigerate for up to 5 days.