Spicy Citrus Buzz

A margarita without tequila usually collapses into limeade. What holds this one up is the jalapeno: the heat lingers after the citrus has gone, which is the job the alcohol used to do. Shake the lime and orange with ice first so it comes out properly cold and slightly diluted, then top with sparkling water rather than shaking it. Add the jalapeno to taste and give it a minute — it keeps getting hotter in the glass.