Heat the oil in a large pot over medium heat. Add the onions and garlic and cook for about 5 minutes, until the onions are softened and lightly browned.
Add the oregano, thyme, basil, and red pepper flakes, and cook for another minute.
Add the lentils and broth and bring to a boil. Reduce the heat and simmer for about 20 minutes, until the lentils are tender.
Stir in the sausage, tomato paste, and kale, and cook for about 10 minutes, until the kale is wilted and the sausage is cooked through.
Season with salt and pepper, and serve topped with Parmesan cheese.
Interesting Facts
Black lentils are a type of legume that have a mild, nutty flavor and are packed with protein and fiber.
Smoked sausage is a great way to add flavor to any dish, and it pairs perfectly with the black lentils in this stew.
Kale is a nutrient-dense leafy green that is full of vitamins and minerals.