The best way is to leave them on the hive. What is temp controlled by the bees, they will liquefy. What isn't will get hot enough from sun to liquefy. Either way, whatever you do will be harder and less efficient than leaving them for the bees.
definitely what Iddee said. even in those places where it gets extremely cold and bee keepers have equipment to deal with matters like granulating honey in the comb. the time and energy required to liquify the honey in the comb is significant.