Tried looking it up for ya, all I could find is that it's a ginger schnapps (Ingwer Schnaps). I guess it contains whatever is in any schnapps (gag, I hate schnapps), plus ginger. Would super-concentrated ginger burn like that? (There was a german website about hot peppers, where someone asked if Ratzeputz has hot peppers in it, but the moderator basically told her to fuck off, so apparently it does not have hot pepper-like ingredients...)