1-Rinse the lentils under cold water and: Rinse the lentils under cold water and set aside.
2-In a large pot, heat olive oil: In a large pot, heat olive oil over medium heat. Add onions, carrots, and celery; sauté until softened, about 5 minutes.
3-Add garlic, cumin, and smoked paprika: Add garlic, cumin, and smoked paprika; cook for another minute.
4-Stir in the lentils, vegetable broth, and: Stir in the lentils, vegetable broth, and diced tomatoes. Bring to a boil.
5-Reduce heat and let simmer for about: Reduce heat and let simmer for about 25-30 minutes, or until lentils are tender.
6-Add spinach or kale and cook until: Add spinach or kale and cook until wilted.
7-Season with salt and pepper to taste: Season with salt and pepper to taste.
8-Serve hot with lemon wedges on the: Serve hot with lemon wedges on the side.