Makes 6−8 servings.

1 cup French green lentils, 8 ounces
1½ teaspoon sea salt, more to taste
1½ tablespoon olive oil
2 cups chopped leeks, white and light green only
1 large onion, chopped
1 medium sweet potato, diced, 8 ounces
1 large carrot, finely diced
1 large stalk celery, finely diced
1 bay leaf
1 bunch green chard, ½ pound
2 tablespoon cumin seed
1 cup chopped cilantro
¼ cup chopped fresh parsley
pinch of cayenne
2−3 cups light vegetable broth
1−2 tablespoon lemon juice, more to taste
garnish: fruity green olive oil

Rinse the lentils and combine them in a large pot with 4 cups water.

Bring to a boil, then lower the heat and simmer the lentils for 25 minutes, or until tender-firm. Stir in a teaspoon of sea salt, remove the lentils from the heat and skim off any foam that may have formed on top.

Meanwhile, heat two tablespoons olive oil in a large sauté pan, add the chopped onion and a pinch of sea salt, and cook slowly until the onion is soft, about 8−10 minutes. Add the chopped leeks and continue cooking for another 20 minutes, stirring often, until the leeks and onions are turning golden.

Add the onions and leeks to the lentils, along with the diced sweet potato, carrots, celery, another 3 cups water, half a teaspoon of sea salt and a bay leaf. Simmer the soup gently, covered, for 20 minutes. Meanwhile, wash the chard, slice away the stems and coarsely chop the leaves. Add the chard and simmer the soup another 10 minutes.

Lightly toast the cumin seeds in a dry skillet, then grind them in a mortar and stir them into the soup. Add the cilantro, parsley, a pinch of cayenne and the vegetable broth. Heat everything together for a few minutes, then add lemon juice to taste.

Drizzle some fruity green olive oil over each steaming bowl of soup as you serve.