Prepare limes by cutting them in halves and hollowing out the peel. This may sound easier than it is. The trick is to take a paring knife and score around the insides carefully to loosen the citrus. Then spoon it out saving the fruit.
Boil one cup of water and add it to jello mix in a large bowl, stirring until it dissolves. Slowly add one cup of vodka and stir.Pour mixture into a cup with a spout (for an even pour). I use a measuring cup. Line up limes on a cookie sheet so they are secure and upright. Pour in jello mixture. Refrigerated over night.
Carefully (gingerly) quarter the halves with a sharp knife.