Nothing beats a big, comforting bowl of slow cooker lentil soup. This easy dump-and-go recipe uses pantry staples and takes minimal hands-on time. It makes a satisfying, flavorful meal that stores well in the fridge or freezer, so it’s perfect for busy weeks or batch cooking.
This crockpot lentil soup is hearty, nourishing, and simple to prepare. Add the ingredients to your slow cooker in the morning, let it simmer all day, and have a warm, homey dinner waiting when you get home. The flavors deepen as it cooks, and a squeeze of lemon at the end brightens the bowl.
Why You’ll Love This Recipe
- Warm and satisfying: wholesome ingredients make a cozy, filling soup ideal for cold days.
- Make-ahead friendly: stores well in the refrigerator and freezes nicely for easy meals later.
- Pantry-friendly: most ingredients are common staples you likely already have on hand.
- Budget-conscious: lentils and simple vegetables stretch a recipe to feed several people without a big cost.
Ingredients You’ll Need
- Mirepoix — onion, celery, and carrots.
- Garlic — minced; add more if you like a stronger garlic flavor.
- Cumin — about ½ teaspoon for warmth; omit if you prefer.
- Tomato paste — adds richness and depth.
- Vegetable broth — low-sodium is recommended; chicken or bone broth can be substituted.
- Herbs — a bay leaf and thyme (fresh preferred; dried thyme works in a pinch).
- Fire-roasted diced tomatoes — if unavailable, regular diced tomatoes are fine.
- Lentils — brown or green lentils hold up well; avoid red lentils in the slow cooker as they can disintegrate.
- Parmesan rind — optional but adds a deep, savory umami note.
- Salt and pepper — to taste.
- Lemon juice — a tablespoon or so added at the end to brighten the flavors.
How To Make Slow Cooker Lentil Soup
- Rinse the lentils to remove any dust or debris.
- Place the onion, carrots, celery, garlic, cumin, tomato paste, thyme, bay leaf, vegetable broth, diced tomatoes, lentils, and parmesan rind into the slow cooker. Stir to combine.
- Cover and cook on low for 6–8 hours or on high for 3–4 hours, until the lentils are tender.
- Stir in the lemon juice and season with additional salt and pepper to taste. Remove the bay leaf, thyme stems, and parmesan rind before serving.
Recipe Variations
- Stir in 1–2 cups of chopped cooked ham for added protein and flavor.
- Add a ham bone to the slow cooker while it cooks to infuse extra savory notes.
- For a creamier texture, blend part of the soup with an immersion blender or in batches in a blender.
- Toss in chopped spinach or kale near the end of cooking for extra greens.
- Add a diced potato or two to make the soup heartier and stretch the batch further.
- Sprinkle red pepper flakes for heat if desired.
Tips and Notes
- Always rinse lentils before cooking to remove dust and any small stones.
- Dice vegetables to your preferred texture: larger pieces for a chunkier soup, finer dice to get a mix of vegetables in every spoonful.
- Finish with shaved parmesan for extra richness, if you like.
- Serve with crusty bread or garlic bread for a satisfying meal.
If lentils remain hard after the recommended cook time, continue cooking until tender. Very old lentils may fail to soften and should be replaced.
Store leftovers in an airtight container in the refrigerator for 4–5 days. Reheat gently on the stovetop or in the microwave.
Yes. Freeze in a freezer-safe container for up to 2 months. Thaw in the refrigerator before reheating.
Recipe
Slow Cooker Lentil Soup
Ingredients
- 1 yellow onion, fine diced
- 3 large carrots, chopped into small pieces
- 3 stalks celery, chopped into small pieces
- 3 cloves garlic, minced
- ½ teaspoon cumin
- 2 tablespoons tomato paste
- 2 sprigs fresh thyme
- 1 bay leaf
- 6 cups vegetable broth, low sodium
- 15 ounces fire-roasted diced tomatoes
- 1½ cups brown lentils, rinsed
- Parmesan rind
- Salt and pepper, to taste
- 1 tablespoon lemon juice
- Chopped fresh parsley, for garnish
Instructions
- Add all ingredients except the lemon juice, parsley, salt, and pepper to a slow cooker and stir to combine.
- Cover and cook on low for 6–8 hours or on high for 3–4 hours, until the lentils are soft.
- Stir in the lemon juice and season with additional salt and pepper to taste.
- Remove the bay leaf, thyme stems, and parmesan rind before serving. Garnish with parsley.
Nutrition
| Calories: 231kcal
| Carbohydrates: 43g
| Protein: 14g
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- Slow Cooker Chicken Drumsticks
- Slow Cooker Whole Chicken
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