How can I do to restore a disk image

I know how to create a disk image of a "Macintosh HD" I've got a "Macintosh_HD.dmg" file save on an external disk
How can to restore It ?
Under os 10.6 I use the DVD,
Click "Disk utility.app"
control and restore image, and after 2 hours, all is clean and restore
Lion is a downlable app, so how can or must I do ?
thank you

Lion creates a hidden partition with a Recovery HD - more info here:
http://support.apple.com/kb/HT4718
You can also create your own with Lion Recovery Disk Assistant.
Regards,
Colin R.

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