Instructions: Put the lentils in a soup pot with 2 1/2 quarts water, turmeric, 1 tablespoon of butter, and 1 tablespoon salt. Bring to a boil, then lower the heat and simmer, covered, until the lentils are soft and falling apart, about 20 minutes. Puree for a smooth and nicer looking soup.

While the soup is cooking, prepare the onion flavoring: In a medium skillet over low heat, cook the onion in 2 tablespoons of the remaining butter with the cumin and mustard, stirring occasionally. When soft, about the time the lentils are cooked or after 15 minutes, add the cilantro and cook for a minute more. Add the onion mixture to the soup, then add the juice of 2 limes. Taste, then add more if needed to bring up the flavors. The soup should be a tad sour.

Just before serving, add the last tablespoon of butter to a wide skillet. When foamy, add the spinach, sprinkle with salt, and cook just long enough to wilt. If the rice is warm, place a spoonful in each bowl. If its leftover rice, add it to the soup and let it heat through for a minute. Serve the soup, divide the spinach among the bowls, and swirl in a spoonful of yogurt.

This recipe yields 4 to 6 servings.

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