I bought some seeds when I was in Spain last fall while I was walking the Camino. I wasn’t positive what this was, but I was pretty sure it was a type of kale or collard greens that was used in a traditional soup called Caldo Gallego served in the Galicia region of northern Spain.
Here is a description that I found online.
Kale Galega de Folhas Lisas.
Smooth leaf green kale from Portugal. Plants are very large and vigorous. The Franchi agent in Portugal claims it is the best-tasting kale. Tender and delicious leaves, reminiscent of collards, by size and color, but leaves are more delicate in flavor, and less coarse. Very pretty and a good producer.