Beef nachos

Method

1. In a dry pan, toast the chilli flakes, coriander and cumin for 1 minute. Remove.
2. Heat the vegetable oil in the pan and brown the beef mince.
3. Stir in the tomato purée, garlic and the toasted spices, then cook for 2 minutes. Pour over the water and simmer for 10 minutes.
4. Add the black beans, drained and rinsed, and cook for 5 minutes. Add the lime juice and coriander leaves. Spoon over tortilla chips, top with the cheese, then grill until melted. Serve with chopped avocado and more cheese.