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I'm not big on cakes. Also they full of empty carbo-hydrates. Do you wanna get fat?
Anyway. It'll probably depends on what you have available. I can recommend a breddy gud one not on the sweet side, consisting of biscuits, sour cream, cocoa and sugar. Maybe something else. I can give recipe in the eve.
Or somlói galuska (you can google it, can look different than picrel). Which is sweet, chocolaty and has a nice rum undertone.