1 medium (8 ounce) yellow or russet potato, scrubbed clean and chopped
1 clove garlic, minced
1/2 teaspoon kosher salt
2 cups vegetable stock, chicken stock, or water
1/2 bunch kale (6 to 8 big leaves), preferably dino, lacinato, or Tuscan
1 teaspoon lemon juice or cider vinegar
1 to 2 large eggs, depending on your appetite
Salt and pepper
Grated Parmesan cheese, extra-virgin olive oil, or yogurt, to serve
Combine the chopped potato, garlic, salt, and stock (or water) in a medium saucepan over medium-high heat. Bring to a boil, then reduce the heat to simmer.
While the potatoes start to cook, chop the kale. Remove any thick, tough stems and chop them into small pieces. Add the chopped stems to the pot with the potatoes and simmer for 2 minutes.
Stack the leaves of kale on top of each other. Slice them crosswise into thin ribbons, and add them to the pot with the potatoes and kale stems. If necessary, add more stock or water to the pot to just about cover the kale.
Cover the pot and let the soup cook for 8 to 10 minutes. The soup is ready when the potatoes are easily pierced with a fork, and when a ribbon of kale has become tender, but has not yet become stringy or pulpy. Stir in the lemon juice or vinegar. Taste and season with more salt and fresh cracked pepper. Also add more stock or water if a more brothy soup is desired.
To finish, crack the eggs into measuring cups, and then gently slide them into the soup. Ladle some of the soup broth on top of the eggs to submerge them. Put the lid back on the pot and cook for 4 minutes. When done, the whites of the eggs should be opaque, but the yolk should still be soft. If the eggs break into the soup before they are poached, just use a fork to swirl them into the soup, like egg drop soup.
Carefully spoon the eggs into a soup bowl. Ladle the soup on top. Finish with a sprinkle of Parmesan cheese, a drizzle of olive oil, or a spoonful of yogurt.
If you have extra time, enrich your soup by sautéing some chopped onions, celery, or carrots before adding the potato and broth, or by adding cooked bacon or sausage. You can also flavor your soup with a few sprigs of fresh oregano or thyme.
Serving More Than One: This soup can, of course, be multiplied to serve several people. If poaching more than three eggs, I recommend poaching them in a separate pot before adding them to individual bowls.
Photo: Emma Christensen