Pour 1/2 liter of good Vodka (Tequila works as well) into a glass pitcher.
Stem a jalapeno and cut lengthwise and drop 1/2 of jalapeno into vodka.
Let vodka sit (no need to refrigerate) for at least 6 hrs or overnight. The longer it sits the spicier your vodka. Strain vodka when ready to use if you don't want seeds in your drink.
Place in freezer to get it nice and cold and enjoy neat or on the rocks.