Step 1

Place the mint leaves, lime wedges, and agave in the bottom of a cocktail shaker or mason jar. With a muddler or the handle of a wooden spoon, mash 4 to 5 times, just enough to release juices and oils. Add the whiskey and top with a small handful of crushed ice.

Step 2

Cover and shake vigorously for 30 seconds to combine. Transfer to an old-fashioned or similar glass. Pile more crushed ice on top. Garnish with additional mint sprigs. Enjoy immediately.