Heat oil in large frying pan; cook onion and garlic, stirring until onion softens. add beef, cumin and chilli; cook, sitrring until browned. Transfer to 4.5L slowcooker. Stir in sotck, paste, undrained tomatoes and oregano. Cook covered on low 8 hours. Add beans; cook, covered on high about 30 minutes or until hot. Season to taste. Sprinkle chilli con carne with coriander; serve with tortillas