Separate the eggs. Whisk the yolks with 100g of sugar until pale and fluffy. In a separate bowl, beat the egg whites until stiff peaks form.
Sift together the flour and cocoa powder. Gently fold the dry ingredients into the yolk mixture, then fold in the beaten egg whites.
Pour the batter into a baking pan lined with parchment paper. Bake at 350掳F (180掳C) for about 12 minutes. Let it cool completely.
For the cream, melt the dark chocolate over a double boiler and let it cool slightly.
Whip the heavy cream until stiff peaks form. Gently fold in the melted chocolate. Prepare the gelatin according to the package instructions and add it to the chocolate cream.
Cut the sponge cake into two equal halves. Spread the chocolate cream evenly over one layer, then top with the other sponge cake layer.
Melt the butter and chocolate together, then spread it evenly over the top of the cake. Refrigerate for at least 2 hours.
Slice the Rig贸 Jancsi and serve elegantly.
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