In a small bowl, mix together the chili powder, paprika, cumin, garlic powder, onion powder, oregano, chipotle powder and 1 tsp salt.

Trim the fat and silver skin from the meat, but keep the trimmings. Chop the beef into bite-sized cubes (about 1 cm square) and season liberally with salt and a few grinds of black pepper.

Put a medium pot on medium-high heat. Add the beef trimmings and let fry until they crisp up and render their fat. If you have to, help out the process by adding a tiny splash of veg oil. Remove and discard the trimmings.

Add the beef to the pot. The meat will release water after a few minutes as it cooks. Don't worry about it. Just keep going until the liquid evaporates and the meat starts sizzling again. Fry until the beef is a deep brown colour. This part will take about 15 minutes.

Stir the onion into the pot. Fry for 3 or 4 minutes until the onions are softened, then add the garlic. Fry another 1 minute until fragrant.

Stir the spice mix into the pot. Let cook for about 3 minutes, stirring occasionally. Watch that the spices don't burn. If they start to get too dark, deglaze the pot with a splash of water.

Pour the canned tomatoes into the pot. Add the beef stock, and turn the temperature down to low. Cover, with the lid slightly ajar, and let simmer for 2 hours. Stir occasionally to ensure the bottom doesn't burn.

Remove the lid and turn the heat back up to medium. If the chili's still watery, give it a few minutes to boil off and reduce. Add the kidney beans and chocolate and simmer for 10 minutes. Give it a taste and add extra salt as required. Finish by adding the corn. Put the lid back on and let the chili sit for at least 15 minutes before eating. Serve with a topping of grated cheddar cheese and/or a dollop of sour cream.