Anna Thomas' Green Soup

(recipe from Food 52)

1 bunch chard or spinach
1 bunch kale
4 to 5 green onions, sliced, white and green parts
1/2 cup loosely packed cilantro
1 tsp. sea salt, plus more to taste
1 medium Yukon Gold potato
1 medium yellow onion
1 1/2 Tbsp. olive oil
Marsala or dry sherry (optional)
1 to 2 cloves garlic, finely chopped
2 1/2 to 3 cups vegetable broth
Freshly ground black pepper
Cayenne
1 Tbsp. fresh lemon juice, plus more to taste

Wash the greeens thoroughly, trim off their stems, and slice the leaves.  Combine the chard or spinach, kale, green onion, and cilantro in a large soup pot with 3 cups water and a teaspoon of salt.  Peel the potato, or just scrub it well if you prefer, cut it into small pieces, and add it to the pot.  Bring the water to a boil, turn down the flame to low, cover the pot, and let the soup simmer for about half an hour.

Meanwhile, chop the onion, heat a tablespoon of olive oil in a skillet, and cook the onion with a small sprinkle of salt over medium flame until it is golden brown and soft.  This will take up to half an hour.  Don't hurry; give it a stir once in a while, and let the slow cooking develop the onion's sweetness.  If you like, you can deglaze the pan at the end with a bit of Marsala or sherry - not required, but a nice touch.

Add the caramelized onion to the soup.  Put the remaining 1/2 tablespoon oil in the pan and stir the chopped garlic in it for just a couple of minutes, until it sizzles and smells great.  Add the garlic to the pot and simmer the soup for 10 minutes more.

Add enough of the broth to make the soup a soup - it should pour easily from the ladle - and puree it in the blender, in batches if necessary, or use an immersion blender.  Don't overprocess, potatoes can turn gummy if you work them too much.

Return the soup to the pot, bring it back to a simmer, and taste.  Add a pinch more salt if needed, grind in a little black pepper, and add a pinch of cayenne and a tablespoon of lemon juice.  Stir well and taste again.  Now use your taste buds - correct the seasoning to your taste with a drop more lemon juice or another pinch of salt, and then serve.  Garnish with a thin drizzle of fruity olive oil.

(This soup is light and flavorful and packed with greens!  If you wanted it a bit heavier, I suppose you could add another potato.  The website also mentions that you could use any greens, any herbs; or bolster the soup with arborio rice, yams, sauteed mushrooms, or squash instead of the potato; shallots or leeks instead of the onion - use the recipe as a template.)