I use Toast Titanium for burning discs on my Mac. You may need to purchase a Blu-Ray plug-in for Toast Titanium. Some versions included it but for other versions it was an additional purchase to activate Blu-Ray functionality that is otherwise grayed out.
Just drag the ISO file into Toast Titanium, with a blank 25GB BD-R in the Blu-Ray burner select the proper optical drive if you have more than one and burn disc. Instant Blu-Ray disc playable on any or at least most Blu-Ray players.