Back in the mid 1970's I was fortunate enough to train under a French chef who had worked not only in France and the United States, but in Morocco. He was able to combine cuisines from all his travels, and this soup was one, among many, that I loved and still make to this day. The combination of spicy, smoky, peppery Harissa with cumin and fresh cilantro infused into the creamy lentils create a delightful treat for your taste buds. He made his using lamb broth, but I find for my family's or guest tastes, chicken broth or vegetable broth work best. This recipe will serve 6 main course portions, 8 first course and still have a bit left over for the following day. Serve with Moroccan style flat bread and a bit of green salad and you have a complete meal.
Heat the olive oil in the bottom of your soup pot. Add the finely chopped onions, celery and carrots. Stir and cook until the onions are slightly translucent. Next add the tomato paste, Harissa paste and Cumin. Stir for another few minutes.
Add the remaining ingredients and simmer until the lentils are tender. This usually takes about 20 minutes, again depending on the lentils. As soon as they are tender, add the chopped cilantro and orange zest, stir into the soup, let it infuse for 10 minutes and then serve.
Notes
Depending on the type of lentils, you may find you need a bit more stock.