Heat olive oil in a large pot over medium heat. Add garlic and onion, cook for 2 minutes until fragrant.
Add celery and carrot. Cook for 7-10 minutes until softened and the onion is sweet, building the flavor base.
Stir in lentils, crushed tomatoes, vegetable broth, cumin, coriander, and paprika. Bring to a simmer.
Skim off any scum from the surface, then reduce heat to low, cover, and simmer for 35-40 minutes until lentils are tender.
Remove from heat. Use an immersion blender to pulse a few times, thickening the soup to your desired consistency.
Adjust soup consistency with a touch of water if needed. Season with salt and pepper to taste. Grate lemon zest over each serving and add a squeeze of fresh lemon juice.
Garnish with fresh parsley if desired and serve hot with crusty bread slathered in butter!
Notes
Nutrition information is an estimate, calculated automatically. Values vary with brands, substitutions and portion sizes.