Peel the apples, cut them in half and remove the core.
Melt the butter with the sugar in a thick-bottomed pan and let it cook gently until the sugar is caramelised.
Put the pan in a container with cold water. ·
Arrange the apple halves on their sides in a circle in the pan, and also fill the middle with apple halves
Then put the pan back on the heat and let the apples boil until they start to give when you press them with your fingers.
Remove the pan from the heat and allow to cool.