Vegan Winter Lentil Stew

Heat olive oil in a large pot over medium heat. Add onion, carrots, and celery, and sauté until softened (5-7 minutes).
Add garlic, cumin, paprika, turmeric, salt, and pepper. Cook for 1 minute.
Stir in lentils, diced tomatoes, vegetable broth, and bay leaf. Bring to a boil, then reduce heat and simmer for 30-35 minutes until lentils are tender.
If using, stir in chopped kale and cook for an additional 5 minutes.
Remove bay leaf, adjust seasoning if necessary, and serve hot!