yes that's the one....i know cause my parents
came from Minho province and prepared this soup many times...i've been
to Portugal several times
and i can attest to the fact that they do not use kale (curly kind). in
Portugal they use what they call
"couve galega" a type of collard green which
isn't grown here in the US. i believe the seeds are
available from some place in California which deals
in unusual/exotic seeds.

i make this soup but i don't use kale, i make it
with finely shredded/chopped collards, however
the collards available in local supermarkets are
slightly bitter and tough.and don't taste quite like
the Portuguese "couve galega".

this soup, Caldo Verde (green soup), became very popular throughout
Portugal and eventually other
cultures picked up on it and have made their own
variations. ...but it definitely is not German in
origin.