Slow Cooker Beef and Lentil Soup is an easy, healthy one-pot meal the whole family will enjoy. It combines tender beef stew meat, hearty lentils, a few simple vegetables, and pantry seasonings to create a rich, satisfying soup.
If you prefer a vegetarian version, try a classic slow cooker lentil soup instead.
Lentils are ideal for slow cooking: they hold their shape and absorb flavor from stock and herbs. This recipe builds depth with beef stock, stew meat, aromatic vegetables, garlic, fresh thyme and rosemary, bay leaves, and a touch of crushed red pepper for warmth.
This soup works year-round. Prep takes about 10 minutes, and cooking in a crock pot is convenient—about 6–7 hours on LOW or 4–5 hours on HIGH. It’s a great option when you want a flavorful, low-effort meal. For a different twist, try a sausage and lentil slow cooker soup.
Recipe Ingredients
- Beef Stew Meat: Pre-diced stew meat or a chuck roast cut into cubes.
- Dried Lentils: Rinse to remove any debris. Green or brown lentils work best.
- Vegetables: Carrots, celery, white onion, and chopped kale (stems removed).
- Beef Stock: Low-sodium is preferred, but regular beef, chicken, or vegetable stock will work.
- Seasonings: Olive oil, garlic, fresh thyme, fresh rosemary, bay leaves, crushed red pepper flakes (optional), and salt.
- See the recipe card below for exact amounts and timings.
Variations
- Add green beans, frozen chopped spinach, mushrooms, or crushed tomatoes for extra texture and flavor.
- Brown the beef in a skillet first for deeper flavor, or use cooked ground beef as an alternative.
- To make a vegetarian version, swap the beef for sweet potato, pumpkin, and mushrooms, and use vegetable stock.
How to Make Beef Lentil Soup
Step One – Dice the onion, celery, and carrots into small pieces and set aside.
Step Two – Cut the beef into medium-sized chunks if not pre-cut.
Step Three – Add 1 tablespoon of olive oil to the slow cooker. Add the garlic, diced onion, carrots, celery, and beef. Add the rinsed lentils on top.
Step Four – Pour in the beef stock until the ingredients are covered.
Step Five – Add fresh thyme and rosemary, bay leaves, salt, and crushed red pepper flakes to taste. Cover and cook on LOW for 6–7 hours or on HIGH for 4–5 hours.
Step Six – About 30–60 minutes before the end of cooking, add the chopped kale and stir. Remove thyme stems and bay leaves before serving.
Best Ways to Serve
Serve the soup in bowls with optional garnishes like grated Parmesan or a dollop of sour cream for richness.
It pairs beautifully with crusty bread and a simple side salad for a complete meal.
Slow Cooker Beef and Lentil Soup
Equipment
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Slow cooker, 6-quart or larger.
Ingredients
- 1 Tbsp. olive oil
- 32 oz. low-sodium beef stock
- 3 carrots, diced
- 1 white onion, diced
- 2 celery ribs, diced
- 2 lbs. beef stew meat, (or a chuck roast, cubed)
- 1 lb. dried lentils, green or brown
- 2 cloves garlic
- 2-3 sprigs fresh thyme (or about 1 tsp. dried)
- 2 bay leaves
- 1 Tbsp. chopped fresh rosemary (or 1 tsp. dried)
- ¼ tsp. crushed red pepper flakes
- 1 tsp. salt
WAIT TO ADD:
- 3 cups chopped kale, stems discarded
Instructions
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Add a tablespoon of olive oil to the slow cooker and add the garlic, onion, diced carrots, celery, and beef.
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Check the lentils and remove any small stones, then add the lentils to the slow cooker.
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Pour in the beef stock, then add thyme, rosemary, bay leaves, salt, and crushed red pepper flakes.
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Cook on LOW for 6–7 hours or on HIGH for 4–5 hours.
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Remove thyme stems and bay leaves, add chopped kale, stir, and cook 30–60 minutes more. Serve warm.
Sarah’s Notes
I recommend using small brown or green lentils that keep their shape. Avoid red lentils if you want distinct lentil texture, as they break down into a creamy consistency.
Soaking lentils for a couple of hours isn’t required, but it can improve digestibility and reduce gas-causing compounds.
Always check lentils for tiny stones before cooking. This soup freezes well—portion and freeze for up to two months for easy future meals.
Nutrition
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Carbohydrates: 52 g
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Protein: 23 g
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Fat: 4 g
Nutrition info is auto-generated. This is an estimate—use your own calculations if you follow a specific diet.
More Slow Cooker Soup Recipes
Slow Cooker Split Pea Soup and Crockpot Beef Barley Soup are classic, hearty choices built from simple ingredients.
Crockpot Busy Day Soup and Slow Cooker Pumpkin Soup offer quick prep and seasonal comfort without sacrificing flavor.
Slow Cooker Italian Wedding Soup, Nacho Soup, and Slow Cooker Tomato Soup each bring something different—cheesy spice, bold flavor, or tender meatballs.