How to burn an OS X Lion boot disc – MacDailyNews - Welcome Home: 2. Right click on “Mac OS X Lion” installer and choose the option to “Show Package Contents.”
3. Inside the Contents folder that appears you will find a SharedSupport folder and inside the SharedSupport folder you will find the “InstallESD.dmg.” This is the Lion boot disc image we have all been waiting for.
4. Copy “InstallESD.dmg” to another folder like the Desktop.
5. Launch Disk Utility and click the burn button.