I did this the first time (based on a post at Metafilter derived from the original article mentioned in this piece - https://www.metafilter.com/115702/Oniongate

I did this the first time (based on a post at Metafilter derived from the original article mentioned in this piece - https://www.metafilter.com/115702/Oniongate https://www.metafilter.com/115702/Oniongate) and that was a good approach because it took me out of the process which meant I didn't touch the onions or fiddle with the temperature or anything and 8 hours later I finally got the difference. Now I cook them in a pan while doing something else. Takes an hour or so but it beats running the crockpot all day.