Tomato Herb Lamb Slow Cooker Lentil Soup

Lentil soups rely heavily on time and good aromatics to develop body, and this combination makes the most of a long, gentle simmer. Browning the ground lamb first brings rich, caramelized depth to the base before everything settles into the slow cooker. As the brown lentils soften, they soak up the acidity of the crushed tomatoes and the herbal warmth of dried oregano, creating a thick, satisfying broth without requiring any extra thickening agents.
Why this one works
- Browning the lamb beforehand creates savory pan fond and prevents greasiness.
- Brown lentils hold their shape nicely during a long low-and-slow cooking cycle.
- Crushed tomatoes supply a rich base that balances the richness of the meat.
- Minimal prep work means hands-off simmering throughout the day.

What you’ll need
- 1 lb (450g) lean ground lamb Cook thoroughly in the skillet and pour off any rendered fat before adding to the slow cooker.
- 1 cup (190g) dried brown lentils, rinsed Check for any small debris and rinse well with cool water before adding.
- 1 can (400g) crushed tomatoes Provides consistent body and light acidity across the whole cook time.
- 1 tsp (2g) dried oregano Crush between your fingers as you add it to release the essential oils.
- 4 cups (950ml) vegetable broth Acts as the liquid medium for the lentils to hydrate and become tender.
TRY THIS NEXT: If these flavors sound good to you, Apple Sage Turkey Slow Cooker Lentil Soup is a natural one to save for next time.
What to have nearby
- Skillet for browning the lamb
- Slow cooker
- Fine-mesh colander for rinsing lentils
- Wooden spoon or spatula
Step-by-step instructions
Start on the stovetop to develop color and render out excess fat from the lamb, then let the slow cooker handle the rest of the work at a steady, gentle heat.
- 1Step 1
Brown the ground lamb in a skillet over medium heat until fully cooked. Drain excess fat.
- 2Step 2
Transfer the cooked lamb into the slow cooker.
- 3Step 3
Add the lentils, crushed tomatoes, oregano, and vegetable broth.
- 4Step 4
Stir to combine all ingredients thoroughly.
- 5Step 5
Cover and cook on low for 6 to 8 hours until the lentils are tender.
- 6Step 6
Serve hot in bowls.
ALSO GOOD: If these flavors sound good to you, Tomato Herb Lean Beef Slow Cooker Tomato Spinach Soup is a natural one to save for next time.
A few things worth knowing
- Ensure you drain the rendered fat from the skillet so the finished soup remains balanced rather than heavy.
- Give the slow cooker insert a thorough stir before locking the lid to distribute the lentils evenly through the broth.
- Keep the lid closed during the low simmer to maintain consistent heat and ensure the lentils cook evenly.
Ways to make it your own
- Top each bowl with a sprinkle of fresh parsley or cracked black pepper before serving.
- Ladle over a scoop of steamed rice or grains for extra heft.
Serving suggestions
Ladle hot into wide soup bowls alongside thick slices of crusty sourdough or toasted flatbread to catch every drop of the tomato-rich broth.
Storage & reheating
Allow any remaining soup to cool completely before transferring to an airtight container. Keep refrigerated and reheat gently on the stovetop over low heat, adding a splash of broth or water if the lentils have thickened.
Nutrition notes
Nutrition is provided as a general estimate for the listed recipe. Brands, exact portions, and ingredient swaps can change the numbers.
Quick recipe answers
Can this be cooked on high heat instead?+
The recipe specifies cooking on low for 6 to 8 hours to allow the brown lentils to tenderize gently without breaking apart.
Do the brown lentils need to be soaked first?+
No soaking is required; simply rinse the dried lentils in a fine strainer to remove dust before adding them to the slow cooker.
With simple prep and steady slow cooking, this soup delivers a bowl of comforting, deeply flavored lentils and tender lamb ready to enjoy at the end of the day.

Tomato Herb Lamb Slow Cooker Lentil Soup
Lean ground lamb and brown lentils simmer slowly with crushed tomatoes, broth, and oregano for a deeply savory, nourishing one-pot meal.

Ingredients
- 1 lb (450g) lean ground lamb
- 1 cup (190g) dried brown lentils, rinsed
- 1 can (400g) crushed tomatoes
- 1 tsp (2g) dried oregano
- 4 cups (950ml) vegetable broth
Instructions
- Brown the ground lamb in a skillet over medium heat until fully cooked. Drain excess fat.
- Transfer the cooked lamb into the slow cooker.
- Add the lentils, crushed tomatoes, oregano, and vegetable broth.
- Stir to combine all ingredients thoroughly.
- Cover and cook on low for 6 to 8 hours until the lentils are tender.
- Serve hot in bowls.
Nutrition
Save the recipes you want to make next.
Browse more recipes or follow the Pinterest profile for the latest food ideas from this collection.


