Sort lentils and discard debris. Rinse lentils and put in a 6- to 8-quart pan. Add 4 cups water, broth, cumin seed, olive oil, cabbage, kale, carrots and tomatoes.
Bring to a boil over high heat, then cover and simmer gently, stirring occasionally, until vegetables are soft and flavors well blended, about 1 hour.
Trim ends from onions and chop onions. Ladle soup into bowls, add onions, and season to taste with salt.
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* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.