Beat the egg whites until stiff, gradually add sugar and beat. Get a shiny foam, into which you gently - just with a wooden spoon - add the ground nuts mixed with flour.
Layer the dough on approx. 8 x 14 in' baking sheet, which you have previously greased and sprinkled with flour. Smooth it well and bake in a preheated oven. Bake at 355 °F / 180 °C for about 30 minutes. Let the baked dough cool down.
If you didn't get to buy the caramel condensed milk, put the regular one in boiling water for 2 hours and let it cool.
Mix the caramel condensed milk with a mixer together with the butter. Get a smooth cream, which you layer on the cooled dough. Smooth it well and put it in the refrigerator to harden.
After it has hardened, pour melted chocolate over the top, to which you have added a piece of butter.
I spread the chocolate and sprinkled with ground nuts and grated chocolate on top. I cut it with a sharp hot knife.