Heat the oil in a frying pan over medium heat, add the onions then the garlic and cook until softened. Add the minced beef and stir until the meat is browned all over. Then add the rest of the ingredients (from Worcester sauce to tomato puree). Reduce the heat and leave to simmer for around 25 minutes until the sauce has reduced and thickened.
Line an oven dish with greaseproof paper. Sprinkle a handful of the cheese in each wrap and top with the minced beef mixture. Fold the wraps and place in the oven dish. Leave a little sauce to spoon over the wraps before topping with the remainder of the grated cheese.
Bake in the oven for 20 minutes at 180°C / 160°C fan / Gas 4. Sprinkle the chopped spring onions and serve with a green salad.