A VERTICAL cake using SIMPLE biscuits. Without OVEN or COOKER STOVE

A VERTICAL cake using SIMPLE biscuits. Without OVEN or COOKER STOVE Ingredients for the cream: sour cream - 600 g ( oz) boiled condensed milk - 300 g (10.6 oz) cream hardener - 2 sachets biscuits - 250 g (8.8 oz) cocoa biscuits - 250 g (8.8 oz) Tray with diameter 26 cm ( in) TO COLD 2 H Ingredients for decoration: mascarpone - 250 g (8.8 oz) powdered sugar - 50 g ( oz) dark chocolate - 100 g (3.5 oz) walnuts - 100 g (3.5 oz) chopped walnuts - 100 g (3.5 oz)