Here's a clever way to present a cocktail! It will no doubt impress your guests. The YouTube channel Cocktail Chemistry shows you how. You'll need a soldering iron. Yes, really!
Making the ice ball requires a special mold--which you then have to use a particular way. After all, you don't want a solid ball of ice, but one that is hollow inside to contain your cocktail. To do so, freeze the ball of water just long enough for it to be wet inside. Then burn a hole in the ice, suck the water out with a syringe, and re-freeze the now hollow ice ball until you need it.