-
1
Place the chopped potatoes, onion, and garlic in a large pot. Cover with the water and season with salt. Bring to the boil, then reduce to a steady simmer. Cook until the potatoes are completely tender and beginning to fall apart — a knife should meet no resistance.
-
2
Remove and reserve the cooking liquid. Pass the solids through a blender or use an immersion blender, adding the cooking liquid back gradually, until the base is entirely smooth — no grain, no lumps, no trace of texture. Return all liquid to the pot. This is where the dish lives or dies: any residual lump in the base will fracture the textural contrast with the greens that the dish depends upon.
-
3
Add the whole chouriço to the smooth base and bring the soup to a gentle simmer. Cook for several minutes so that the paprika-rich fat from the chouriço disperses into the broth. Remove the chouriço, slice it into rounds, and set aside.
-
4
Bring a separate small pot of well-salted water to a rolling boil. Add 1 tablespoon of olive oil, then add the kale chiffonade and blanch briefly — no more than 1 minute — so that each ribbon is coated and the chlorophyll is set. Drain immediately.
-
5
Bring the potato base back to a full boil. Add the blanched kale chiffonade and cook for no more than 2 minutes. The greens must retain their vivid green colour and offer slight resistance when pressed between the fingers — any yellowing or softness means they have cooked beyond the point of recovery.
-
6
Ladle the soup into warmed bowls. Place one or two slices of chouriço into each bowl. Finish with a generous thread of raw olive oil poured directly over the surface — not a garnish, but a structural element that carries the soup's aroma on approach.