Coarsely chop almonds and pistachios. Caramelise 150 g sugar in a pot until golden brown. Add cream and cook the caramel at low heat until the caramel has dissolved in the cream
Chopping chocolate. Melt with the butter at low heat. Beat the eggs, salt and 350 g sugar with the whisk of the hand mixer for about 5 minutes until thick and creamy. Stir in the syrup. Mix flour, baking powder, half of the pistachios and 30 g almonds in a bowl. Stir chocolate butter into the egg mixture. Stir in the flour mixture. Grease a square springform pan (24 x 24 cm) and dust with flour. Fill in the dough and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 35 minutes, if necessary cover the last 10 minutes with aluminium foil.
Take the cake out of the oven and prick it several times with a wooden skewer. Drizzle the caramel sauce onto the cake, except for 2 tablespoons. Sprinkle with marshmallows, remaining almonds and pistachios. Bake at the same temperature for another 5 minutes. Let cool on a cake rack for about 10 minutes. Spread the rest of the caramel sauce on the cake. Remove the cake from the springform pan and let it cool down for about 1 hour
Waiting time approx. 10 minutes