Crush walnuts, cashewnuts and almonds in a mixer. Heat condensed milk in a non stick pan, add chocolate and melt the two together. Get the coffee machine ready. Insert a coffee pod in the socket and switch the machine on.
When the brew is ready, collect the shot in a cup and add it to the condensed milk-chocolate mixture. Mix well and heat till well blended. Chill four tall glasses.
Line the glasses with a little chocolate sauce. Put a scoop of vanilla ice cream, pour a little chocolate sauce, sprinkle a little of the crushed nuts. Repeat these layers till the glasses are almost full.
Place a scoop of cookie ice cream on each, drizzle a little chocolate sauce and decorate with a whipped cream rosette.