There's no shortage of falafel places in Berlin representing all the great falafel countries of the world. For €4 Dada will give you their own version in bread. They use fresh raw vegetables (nothing unusual in that mix), a pretty mild chilli sauce, and a falafel that is heavily spiced on the mildly crisp (could've easily been more) crust and contains quite a lot of green herbs in the mix.
It's a good one.
Their döner also has discernible meat layers so that could be an alternative for next time.
