Heat oil in a pan. Brown the beef in batches (don’t overcrowd) until caramelised. Transfer to slow cooker.
2. Aromatics
In the same pan, sauté onion, garlic, capsicum, carrot, celery (and zucchini if using) for 5 minutes until softened. Stir in tomato paste, paprika, cumin, coriander, chilli powder, oregano. Cook 1–2 mins to toast the spices.
3. Combine
Transfer veggies and spices into the slow cooker. Add canned tomatoes, stock, optional cocoa/Worcestershire, and season. Stir well.
4. Slow cook
• Low: 6–8 hours
• High: 3–4 hours
5. Final touches
If too runny, take the lid off for the last 30 mins to thicken, or stir in a spoonful of cornmeal/masa harina. Adjust seasoning before serving.