Add the onions to the oil, stirring to coat and scraping the pan to release any browned bits from the searing.
Cook for about 4 minutes, until lightly browned, then add the garlic; cook for about 30 seconds, then stir in the gochujang, tomato paste, soy sauce, Maggi seasoning, and the chili powder-spice mixture.
Cook for about 1 minute, then stir in 1 1/2 bottles of the beer into the chili; drink the other half of the second bottle. (A total of 16 to 18 ounces of beer should end up in the chili.)
Add the coffee, chocolate, masa harina, and tomatoes.