So I made this cake using half of the remaining babka dough. The filling is ricotta, dark chocolate (70% cocoa), toasted almonds and apricot kernels (tastes like bitter almond, but not bitter...), a little of the candied orange peels I made a couple of months ago, amaretto, cinnamon and a little sugar.
Next time I'll up the ricotta to mixins ratio (as in more ricotta), and I might also try using marzipan instead of almonds, I expected it's crispness to be a welcomed extra texture, but I found it to be distracting.