Cut limes in half and squeeze to get 2 tablespoons of fresh juice.
Place mint leaves in the glass and gently muddle to release oils.
Add lime juice and simple syrup to the glass.
Fill the glass with crushed ice.
Pour Sprite slowly over the ice mixture.
Stir gently to combine all ingredients.
Add a lime wedge and mint sprig as garnish.
Notes
The drink tastes best when served right away while the Sprite is still fizzy.Store extra mint leaves wrapped in damp paper towels in the fridge.Regular ice cubes work too, but crushed ice makes the drink extra frosty.For a sweeter version, add an extra 1/2 tablespoon of simple syrup.Skip the muddling step if you want a milder mint taste.