I am happy, this brings back good memories to you! The fully latin name Scorzonera hispanica suggests that escorcionera is originated to the Iberian Peninsula. The name means black adder because it was considered efficacious against snake bites. If you find it then try it out. But please take care of your hands! The gluey white chyle sticks on them and turns brown and ugly. You could also cook the roots before peeling to avoid this.
Thank you for your kind words and your support!