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Heat olive oil in a large stock pot or Dutch oven over medium heat for one minute.
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Add carrots and sweet potato to the hot olive oil. Sautee for 7 minutes while stirring occasionally. Add the onions and sauté for 3 minutes while stirring.
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Add garlic, thyme, and all the seasonings, mix well, and cook for two minutes. Add vegetable stock and water. Bring to a simmer, and cook with lid on until tender, about 15-20 minutes.
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Reduce the heat to low. Using an immersion blender, blend the soup until smooth. If you don’t have an immersion blender, you can add a few cups at a time to a blender and puree until smooth. Once the soup is smooth, add the lentils and increase the heat to medium. Simmer soup for 15-20 minutes until lentils are tender.
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Remove thyme sprig and serve when slightly cooled. Soup will last for two weeks in an air-tight container in the refrigerator or two months if frozen.