Remove the chorizo from the casing and add to a mixing bowl with the beef mince, onion, coriander, parsley, smoked paprika, cumin and chilli flakes. Mix everything together then place into a frying pan over medium heat and cook for 2 minutes. Add the tomato paste and cook for a further 5 minutes or until everything is cooked through. Remove the pan from the heat and let the mixture cool before storing in a container in the fridge overnight. This intensifies the flavour.