They are quite popular here, where they are known as Gila.
I first encountered them in the form of a filled pastry in the supermarket, labelled
pasteis de gila and had absolutely no idea what it was but bought some anyway in the hope that they weren't actually made of
gila-monsters.
Turns out they take the stringy flesh and cook it up with sugar to make a very sweet but to my mind not very flavourful pastry filling. In Spain they refer to the same sort of thing as
Cabell d'àngel, or
angel hair
You can also buy gila jam, aka
doce de gila, in the supermarkets.
.