Quarter a couple of jalapeno peppers, remove the seeds and pith, jam them into a big bottle of gin and leave it sit for as long as you can.
Fill a cocktail shaker with ice cubes and the gin. Add a dash of dry vermouth, about 1/12 as much vermouth as you've got gin.
Shake it up and strain into a Martini glass.
Surprisingly hot, and good for you too! Maybe use just one pepper...