Rustic Potato Soup

Some might consider caldo verde, a thick soup of kale, potato, and sausage, the national dish of Portugal. It’s a rib-sticking, one-pot meal that, as we found, requires little effort. Here’s what we discovered:

Test Kitchen Discoveries

• Substitute kielbasa for hard-to-find Portuguese linguiça sausage. The garlicky, spicy flavor of the two sausages is similar.
• Partially mash a portion of the potatoes to thicken the soup.
• Cook the leeks and the kielbasa together, and then stir them into the potatoes, broth, and kale.
• Leeks can be very dirty and hard to clean. We recommend cutting the leeks, then soaking them in water and draining them.