Caldo Verde is a hearty and traditional Portuguese soup made with potatoes, smoky chorizo, and fresh kale. In my version, I substitute kale for spinach.
Sautée the potato base: Heat 3 tablespoons of oil over medium heat in a large saucepan or deep skillet. Add the minced onion and garlic, stirring constantly, and sautée for 3 minutes. Add the thinly sliced potatoes and sautée for another 3 minutes, stirring constantly.
Boil the potato mix: Add the 2 quarts or 2 liters of water and bring to a gentle boil until the potatoes are tender. Depending on the type of potato, this should take about 20 to 25 minutes.
Cook to remove excess fat from the sausage: This step is important for a better-tasting, smoother, and slender dish. Cook the chorizo over low to medium heat for 5 to 7 minutes and strain the excess fat.
Blend the mix inside the saucepan: Use an immersion blender on low speed to avoid splashing the pureed potato mix and damaging the saucepan. Add salt and pepper to taste.
Add the Spinach and Chorizo: Stir and simmer until the spinach is cooked.