Step 1: Heat the oil in a large saucepan or Dutch oven over medium heat. Add the leeks and cook, stirring occasionally, until they begin to soften, 3 to 4 minutes. Add the garlic and cook another minute.
Step 2: Add the tomatoes and cook, breaking them up with a spoon, for 5 minutes.
Step 3: Add 6 cups water and bring to a boil. Stir in the sweet potatoes, kale, lentils, thyme, salt and pepper. Add the optional crushed red pepper, if using. Simmer until the lentils are tender, 25 to 30 minutes.
Step 4: Spoon into bowls and top with the Parmesan.
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