Minho, Portugal
Portugal's national soup — the simplest, most honest food in the country. Potato puréed into broth, finished with extremely finely shredded couve galega (Galician cabbage), and served with a slice of chouriço and a splash of olive oil. The shredding technique for the couve is the critical variable: the leaves must be rolled tightly and cut across into thread-thin ribbons — 1-2mm maximum. Any thicker and the texture is wrong. Caldo verde is the food of Minho and Trás-os-Montes, the rough green north of Portugal. It is served at every wedding, every baptism, and every Sunday lunch. It predates almost every Portuguese national dish in recorded history.
Mash the potato directly in the broth — no cream, no butter, no blending. The potato starch thickens the soup to a velvet consistency. The couve is added 3-4 minutes before service only — it should be just wilted, not cooked. The shredding must be very fine — as thin as possible. The chouriço is cooked separately in water (or directly in the soup for a smokier broth) and added as a garnish. Finish with olive oil.
The rolling-and-shredding technique: remove the central rib of each couve leaf, stack 4-5 leaves, roll into a tight cylinder, and cut across the roll as thinly as possible. This technique (corte em chiffonade) is the same as French chiffonade but applied to a tougher leaf. Couve galega is available at Portuguese specialty food shops — young kale is the best substitute. Pair with vinho verde.
Thick-cut cabbage — completely wrong texture and presentation. Blending the potato — produces a different texture and appearance. Adding the cabbage at the start — it becomes soft and loses its green colour. Under-salting the potato — the flavour backbone of the soup is in the potato.
My Portugal by George Mendes