I was wondering if there is a way to remove the onion layers in an intact way so they're not broken or damaged. I've done this before by slightly baking the onion until it softens
I once made onion bowls by slicing the onion at the point where it just starts to curve back in and soaking in water while I seperated the layers. It worked for my purposes but I did destroy a few in the process. I think I might have added some salt to the water they were soaking in to boost the water content of the onion, which could have affected how easily they seperated.
It depends on how much of the "bowl" you need to be intact. If you don't mind cutting the onion in half and then slicing off say about 1/2" off each end, so you have a truncate hemisphere, then you can wiggle off individual layers pretty easily.