Blend the watermelon until smooth (you will end up with about 28 ounces). Add the lime juice and blend again.
Drop in the sliced jalapeno and allow to infuse the watermelon limeade for 30 minutes or so. The flavor will become more pronounced the longer you leave the jalapeno in...be careful when you are tasting the drink as you don't want the raw jalapeno to make contact with your lips.
Use a slotted spoon to remove the jalapeno pieces and save in the refrigerator to make another batch of the cocktail. Blend the juice again before serving, then pour into glasses over ice (you can strain the juice before serving, if you like, but I did not find it necessary).
Garnish with additional fresh lime and add vodka to taste, if desired.
I grew up in a restaurant family (my parents owned the now closed Quilted Giraffe in NYC) and I've always loved to cook.
My interest in the connection between food and health led me to pursue a graduate degree in naturopathic medicine. I don't practice medicine anymore; I have a blog called Healthy Green Kitchen that I started in May of 2009 and I wrote a book called One Simple Change that will be published in January, 2014.
I live in upstate New York with my family and many pets.