Ingredients:

1 sprig fresh mint
3 slices lime
1 tablespoon agave nectar, or honey
ice
6 oz soda(180 mL), or seltzer water
 
Method:

Add mint leaves and lime to a tall glass.
Using a muddler or a spoon, mash the lime and mint well.
Add sweetener, ice, and soda water. Stir to combine.
Garnish with lime and mint. Enjoy!