One question though, how long did you cook to get the onions to turn that colour? Obviously this is a '3 hour base' but not sure it that relates to the total time or just the initial cooking of the onions, et cetera. Could you clarify? I think I cooked for roughly 3 hours and my onions, although soft, did not turn that colour. Perhaps I was not aggressive enough with the heat.
Chewy - not sure if you've seen the above question or not. 
Hi Ramirez
Sorry I missed it. This is a duplicate answer, on Ray's Thread
It took me 3 hours in total, one lazy Saturday afternoon in March.
The first video I did, only took 1hour in total, and was not as sweet.(pressure cook 30mins)
If I want a really sweet base I leave the onions whole (pressure cook 30mins)
The point people may seem to be missing, is that there should be 90% onion in any base recipe.
The more onions the better/sweeter! If your want to mimic what they do in all BIR/TA's I know and probably in your local,
Boill them whole. @100 degrees!
Here's some random poor quality phone snaps
one with the foodmill in action
cheers Chewy