Shape the minced beef into 4 patties.

Heat the oil in a frying pan, add the patties and cook for 4-5 minutes, turning once.

Remove the patties and set aside.

Drain any fat from the pan.

Combine the sauce mix and water.

Add to the pan with the kidney beans.

Bring to the boil, stirring constantly, then simmer for 5 minutes. Stir occasionally.

Season to taste with chilli powder.

Return the patties to the pan and cook for a further 5 minutes.

To serve, place a 'burger' on each bun. Spoon the bean sauce over and top with grated cheese.