burn OS X Lion installer to disk?
Can I burn OS X Lion installer to a disk for a mac mini installation?
iMac (27-inch Mid 2011), macOS High Sierra (10.13.6)
Do you have an existing functional install of Lion? Use Target Disk Mode to clone the copy over to the Mac mini.
If it runs Lion, it should be able to use it from the cloned copy. Mind you you are only licensed to have one copy, and should follow the license requirements for backing up.