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Open up Disk Utility and the iso should appear on the left. Just select it and click the burn button (upper left corner).
 
Okay, now I see the actual question - subject line was misleading. I was somewhat confused since the bootability is either part of the image itself or it's not (in other words, the .iso has to be an image of a bootable disk). Nothing to do with what utility you use to burn it.
 
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