Торт "Египетский" необычайно нежный и безумно вкусный ✧ "Egyptian" Cake (English Subtitles)

For 1 layer and a 30x40 cm baking tray (I baked 2 layers): 5 egg whites 125 g of sugar 30 g of all-purpose flour 100 g of ground walnuts For the custard: 10 egg yolks 300 g of milk 250 g of sugar 100 g of flour 160 g of butter 1 tsp of vanilla extract For praline cream: 400 g of heavy whipping cream 150 g of hazelnut 150 g of sugar 3 tbsp of icing sugar (optional) The cake is about 2 kg