Slow Cooker Mediterranean Lentil Soup
A warming vegetable-forward lentil soup brightened with lemon and spinach. French green or brown lentils become tender and creamy while simmering with aromatic vegetables, cumin, and fresh citrus. Serve as a light lunch or dinner starter, perfect for meal prep or feeding a crowd. This version relies on slow cooking for deep flavor development without active stovetop time.
Ingredients
- 1 cup dry lentils, French green or brown
- 2 whole yellow onions, chopped
- 2 ribs celery, finely chopped
- 2 whole carrots, finely chopped
- 1 whole potato, peeled and grated
- 1 clove garlic, minced
- 1 teaspoon cumin seeds
- 1 teaspoon lemon zest
- 6 cups vegetable broth
- 10 ounce frozen spinach, chopped, thawed
- 2 tablespoon lemon juice
Instructions
- 1
Sort and rinse lentils under cold water.
- 2
Chop onions, celery, and carrots finely. Peel and grate potato. Mince garlic.
- 3
Add lentils, onions, celery, carrots, potato, garlic, cumin seeds, lemon zest, and vegetable broth to slow cooker.
- 4
Cover and cook on low 8-10 hours or high 4-6 hours until lentils and vegetables are tender.
- 5
Stir in thawed spinach and lemon juice.
- 6
Cook on high 20 minutes more.
Tips
French green lentils hold their shape better than brown varieties during long cooking; brown lentils become creamier if that texture is preferred.
Thaw spinach before adding to reduce cooking time and prevent diluting the broth with excess water.
Good to Know
Refrigerate up to 5 days in airtight container. Freezes well up to 3 months in portion-sized containers.
Prepare lentils, vegetables, and zest night before. Assemble in slow cooker in morning and cook.
Ladle into bowls. Offer crusty bread, feta cheese, or a dollop of Greek yogurt on the side.
Common Mistakes
Do not skip rinsing lentils to avoid gritty texture.
Do not add spinach at the start to prevent mushy greens and color loss.
Substitutions
brighter citrus note
FAQ
Can I use canned lentils instead of dry?
Yes. Use 3 cans (15 ounces each) drained and rinsed. Reduce cooking time to 2-3 hours on low or 1-1.5 hours on high, adding canned lentils halfway through.
What if I don't have a slow cooker?
Use a Dutch oven. Bring broth to boil, add lentils and vegetables, reduce heat to low, cover, and simmer 45-60 minutes until tender. Finish with spinach and lemon as directed.
How long can I keep this soup?
Store refrigerated up to 5 days. Freezes well for 3 months. Thaw overnight in fridge before reheating on stovetop with a splash of broth if needed.