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Instructions
Heat olive oil in a skillet over medium heat. Add onion and carrot; cook and stir until softened, about 4 minutes. Add thyme sprigs, garlic, ½ teaspoon salt, pepper flakes, and black pepper; cook and stir for 1 minute.
Stir in chicken broth, tomatoes and their juice, and lentils; cover skillet. Simmer until lentils are tender, about 40 minutes. Add kale, lemon zest, and lemon juice; cook until kale is wilted, about 5 minutes. Season with salt and black pepper.