Build your fire and let it burn down to a bed of good glowing coals, at least 45 minutes before you start cooking.
Set up a tripod with a hook to hold the Dutch oven by its handle, or a sturdy grate positioned at least 8 inches (20 cm) above the coals.
Heat the olive oil in the Dutch oven.
Sear the diced sirloin tip beef in the hot oil, a few pieces at a time so they brown instead of boiling in their own juices. Set the seared pieces aside as you go.
Brown the ground beef in the same pot, breaking it up as it cooks, then set it aside with the sirloin.
In the same pot, soften the onion, poblano pepper, and jalapeño pepper(s).
Stir in the garlic and the chili spice mix and cook until fragrant, about a minute.
Return the beef to the pot, then add the chipotle pepper in adobo sauce (or the pimentón) and cover with the beef broth.
Add the crushed tomatoes, the Worcestershire sauce, the salt and the espresso, and stir well.
Bring it to a boil with the pot hanging as close to the flames as you can get it. Then move it to indirect heat — swing the tripod out, or shift the pot to a quieter corner of the fire — and leave it uncovered. Let it simmer gently for about 40 minutes, stirring regularly so nothing catches on the bottom.
Add the drained kidney beans and pinto beans, the maple syrup and Tabasco to taste. Keep cooking over low heat, stirring regularly. Taste. Adjust. Taste again. Adjust again. Let it reduce slowly until it reaches the consistency you want, about 2 hours.
Season with salt and pepper, and serve with cornbread, grated cheese, green onions, sour cream and more Tabasco.