Onion Soufflé Cooked Inside an Onion...
First, boil the onions to soften them. Then core them down to one or two layers. Don't go too thin, or you'll later suffer a containment breach. Fill them with the soufflé mix and bake for 30 minutes at about 400&...
https://www.neatorama.com/2012/09/16/Onion-Souffl-Cooked-Inside-an-Onion/
