One large ice cube rather than several standard-size ice cubes is best for an old fashioned. Thanks to its size, this kind of ice cube melts slower and doesn’t give us too much dilution. Sure, we want some dilution, but we also don’t want a watered down drink. If you don’t have a large-ice mold, you can pick up one on Amazon. You can find tons of affordable options in different shapes to suit your taste.