Put the closed can in a saucepan with water and cook for about 2 1/2 hours. That makes the caramel.
Important: The can must always be completely covered with water! You can also pour the contents of the jar into a jam jar beforehand, screw the lid on, and cook it. Let cool down well before opening.
Whip the cream until stiff and fold into the caramelized condensed milk. Fill the whole thing into small glass bowls etc., cover with cling film and place in the freezer for at least 4 hours.