I make without onion and add a little more garlic. Last time I made it I couldn't find the cans of diced chili peppers and it still turned out tasty. I used chopped peppers that I prep ahead of time and freeze which are red, yellow and orange peppers.
Also not my recipe, it would not let me enter the URL. It is from http://pearls-handcuffs-happyhour.blogspot.com/2010/11/five-starsand-then-some.html