I forgot to add this a while ago but the recipe also works with lemon juice as well. I also have been using blancos and they are very good as well.
I tweaked it a little:
1.5-2oz. blanco or reposado
1oz. natural strength lemon or lime juice(fresh is perfect)
1.5 teaspoons agave nectar
Put all ingredients in a shaker filled with ice, shake vigorously for 20 seconds and pour into 2 sugar-rimmed shot glasses. Enjoy
