In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté for about 5 minutes, or until softened and translucent.
Stir in the minced garlic and cook for another minute until fragrant.
Add the diced carrots and celery to the pot, and sauté for an additional 5 minutes until they start to soften.
Incorporate the sliced mushrooms into the pot and cook for about 4-5 minutes until they release their moisture and begin to brown.
Sprinkle in the dried thyme and smoked paprika, stirring to coat the vegetables in the spices.
Pour in the vegetable broth and add the rinsed lentils and canned diced tomatoes (with juice). Bring the mixture to a boil, then reduce the heat to low and let it simmer for 30-35 minutes, or until the lentils are tender.
Stir in the chopped kale during the last 5 minutes of cooking to wilt it into the stew.
Season with salt and black pepper to taste, adjusting as necessary.
Remove from heat and let the stew rest for a few minutes to allow the flavors to meld.
Notes
Serve hot in deep bowls, garnished with freshly chopped parsley. Pair with crusty bread for a satisfying meal!