Let the puff pastry squares rise as usual in the oven at 200 ° C (top / bottom heat) until they are golden brown. Then let cool down a bit. Continue to leave the oven at 200 ° C.
Beat the egg whites until stiff. Now, relatively quickly, place a scoop of ice cream on top of the puff pastry, put a meringue topping on top and put it in the oven as quickly as possible until the layer of egg whites is firm and browned slightly. Now just put the sauce on top and enjoy!