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°F.
Link (Translation) -via Tasteologie
Might be nice if the translation was intelligent and understandable.
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Containment breach? Eject the core!
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