Sauté onion in a splash of oil, add mince and brown.
Mix sachet contents with 400 ml water and pour over the browned mince.
Bring to the boil, stirring often, then simmer for about 10 min.
Add butterbeans, tomato sauce, Worcestershire sauce and Parmesan cheese to the mince and simmer for 3 more min.
Serve in a burger roll, pita pocket or use as a pizza topping.