Heat sugar, butter, cream and salt in a saucepan and cook for about 5 minutes, stirring frequently, to caramel. As soon as it starts to smell smelly, pull the pot off the fire immediately. Due to the brown sugar, the degree of caramelization is a little difficult to assess. Let the caramel cool down briefly.
Puree the bananas with the cutting stick. Add the caramel and puree finely. (The mass is about 400 ml for four people)
Mix the mascarpone and yoghurt together until smooth, add 3/4 of the caramel and banana mixture and mix thoroughly. Smooth out the cream. Pour the rest of the mixture over it as a topping.