I’ve eaten half of the cake! Very delicate, without baking!

I’ve eaten half of the cake! Very delicate, without baking! Ingredients: biscuits - 200 g (7 oz) walnuts - 200 g (7 oz) IN THE OVEN 180 °C (356 °F)/10 minutes for the cream: milk - 650 ml (22 fl oz) cocoa - 40 g (1.4 oz) starch - 80 g ( oz) butter - 50 g ( oz) Tray diameter 20 cm (8 in)