I don’t use onions or green peppers.
The real secrets are a couple of tablespoons of cocoa powder, and about 4 ounces of red wine. Finely chopped spinach is good too, amps up the nutritional value. Also, at least 3 different beans; I like kidney, black, pink, and red. Then at the end, balance the Cumin and Salt, with some lime juice for some acid.
As a kid, I remember hearing about simulating gravity by spinning a space ship. I was excited to see it happen in 2001, so my recollection is that it was already a known concept, and I was just a kid at the time.