This brief post is just my notes specifically on how to make a Mac OSX Lion install DVD from within macOS Catalina. This isn’t really meant to help anyone other than my future self. But I hope it helps the odd other person too.
Step 0. Optionally order a copy from Apple, do a search online and you can find Lion and Snow Leopard disks still available for order directly from Apple, as of late 2019.
Step 1. Get the Installer Image from Apple (I’ve personally been archiving these for a while).
Step 2. Open the Terminal, enter the command:
hdiutil burn LionInstaller.iso
That’s it. Done. Here’s example output: