I noticed a lot of frustrated Mac users out there on the subject, I figured it out this week and it is easy and possible. Long live Dreamcast!
Things you’ll need: an internal or external writeable CD Drive on your Mac, and 700MB CD-Rs. Download and install the latest versions of Keka (My version was 1.0.12) and LiquidCD (My version was 2.08).
Wallpaper Credit: Deviantart/Blueamnesiac