Place white chocolate in a microwave-safe dish. Place in the microwave for 30 seconds. Stir. Put the chips back in the microwave for 20 seconds more. If still not melted add 10 seconds more. Dip each martini glass rim into the melted chocolate. Allow excess to drip off before placing each rim into the crushed candy cane. Place glasses in the refrigerator. Meanwhile, Combine the Kahula, Peppermint Vodka, ice, and half and half in a cocktail shaker or mason jar. Shake until combined and frothy. Carefully pour the contents of the shaker or jar (without ice) into each martini glass. Serve with a mini candy cane for stirring.