80/20 is a good mix for chili, but if someone has health issues (especially two heart attacks), you gotta' do what you gotta' do.
As for Mexican food in Chicago, you have Rick Bayless in Chicago. His
Frontera Grill is true Mexican food, and one of the best Mexican restaurants in the US. Most "Mexican" food in the US is based on Tex-Mex.
Rick Bayless | Frontera Grill
He owns several restaurants in Chicago.
Rick Bayless | Restaurants
As for my kitchen, I make and eat a lot of tacos/fajitas. They are quick and easy. I mostly use flour tortillas, because corn tortillas really need to be made right before you use them, or they dry out and fall apart while you are eating your tacos. I can make corn tortillas, but tacos are a quick weekday meal for me, so I don't usually want to take the time to make them.
By the way, my go-to place for Tex-Mex is
Frisco Menus - Mariano's
CD