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Slow cooker beef and lentil bolognese

A bolognese of lean ground beef stretched with red lentils, cooked slowly until the lentils melt into the sauce. It makes six portions; cook the spaghetti fresh for whichever ones you are eating and freeze the rest of the sauce.

By The foodose editorial team. Nutrition calculated from USDA FoodData Central. Checked on paper on 16 October 2026; not yet cooked in a test kitchen or photographed, so the times and yield are estimates. How we develop our recipes
What still needs a real kitchen
  • Confirm the red lentils collapse in 6 to 8 hours on LOW with 300 ml of stock
  • Confirm the hob alternative of 45 minutes
  • Photograph the finished plate
Time
About 6 hr 25 min
estimated
Serves
6
see below
Energy
515 kcal
per serving
Protein
35 g
per serving
Jump to recipe
Not yet photographed. The panel names the dish’s main ingredients rather than showing a picture we have not taken.

Ingredients for 6 servings

6 servings

Check off ingredients as you go.

Contains celery, gluten, milk. Check the labels on packaged ingredients:

  • chopped tomatoes. Tinned tomatoes vary in added salt; the sodium figure uses a standard salted tin.
  • beef stock. Stock often contains celery, and sometimes gluten or soya; check the label.
  • spaghetti. Most dry pasta is just wheat and water, but some contains egg; check the packet.
  • Parmesan. Parmigiano Reggiano is made with animal rennet, so it is not vegetarian. Vegetarian Italian-style hard cheeses are widely sold.

Cooking steps

  1. Warm the oil in a large frying pan over medium-high heat and brown the beef for 8 to 10 minutes, breaking it up, until the liquid has cooked away and it starts to catch on the base.

  2. Push it to one side, add the finely diced onion, carrot and celery and cook for 5 minutes, then stir in the crushed garlic, oregano and tomato purée for 1 minute.

  3. Scrape everything into the slow cooker with the tinned tomatoes, the red lentils, rinsed until the water runs clear, and the stock. Cover and cook on LOW for 6 to 8 hours or HIGH for 3 to 4 hours, until the lentils have collapsed into the sauce and it reaches 71°C in the centre. On the hob, simmer it covered for 45 minutes, stirring often.

    Cooked when: 71°C / 160°F in the centre, with no pink left. A food thermometer is the reliable way to tell.

  4. Cook 60 g of spaghetti a portion, only for the portions you are eating, in well-salted boiling water for 1 minute less than the packet says. Toss it with the sauce and finish each plate with 5 g of grated Parmesan.

  5. For the rest of the sauce, divide it between containers, leave them uncovered until the steam stops, no more than an hour, then cover and refrigerate or freeze. Cook the spaghetti fresh on the day.

The useful detail

The lentils go in dry and absorb about three times their weight in liquid, which is why there is more stock than a bolognese usually needs. They thicken the sauce as they collapse, so it needs no reducing at the end.

Make it work for you

One serving is A sixth of the sauce over 60 g (dry weight) of spaghetti, with 5 g of Parmesan. You can switch to a smaller portion in the ingredients above; it is three quarters of this, and it contains correspondingly less energy and protein. It is an option, not a goal.

  • Turkey mince instead of beef

    Lighter and milder. It must reach 74°C rather than 71°C.

    Per serving: about the same energy, about 2 g less protein, about 1 g more fat.

  • Wholemeal or any dry pasta instead of spaghetti

    Shapes such as penne hold the sauce better in a lunch box.

    Per serving: about the same energy, about the same protein, about the same fat.

  • Leave out the Parmesan

    Less savoury; nothing else changes.

    Allergens: Removes milk.

Estimated nutrition

Per standard serving, calculated from the ingredients above. Nutrition changes with substitutions, brands and how much oil stays in the pan.

A bolognese where the red lentils sit alongside the beef rather than replacing it, which keeps over 30 g of protein a plate and adds fibre a meat-only sauce does not have.

Nutrition per serving
Energy515 kcal
Protein35 g
Fat10 g
of which saturates4 g
Carbohydrate70 g
of which sugarsnot calculated
Fibre8 g
Sodium410 mg
Show calculation notes

Each ingredient’s weight is multiplied by its USDA FoodData Central values per 100 g. The whole recipe is added up and divided by 6. Raw weights are used for meat, fish and vegetables; beans and lentils are drained weights. All of the oil is counted as eaten. Added salt is not included; sodium from stock, bread, cheese and tinned food is.

Calculation, whole recipe
IngredientWeight usedSourceEnergyProtein
olive oil9 gFDC 171413Oil, olive, salad or cooking80 kcal0.0 g
lean beef mince500 gFDC 173110Beef, ground, 93% lean meat / 7% fat, raw760 kcal104.3 g
onion150 gFDC 170000Onions, raw60 kcal1.7 g
carrot150 gFDC 170393Carrots, raw62 kcal1.4 g
celery100 gFDC 169988Celery, raw14 kcal0.7 g
garlic15 gFDC 169230Garlic, raw22 kcal1.0 g
dried oregano1 gFDC 171328Spices, oregano, dried3 kcal0.1 g
tomato purée30 gFDC 170459Tomato products, canned, paste, without salt added (Includes foods for USDA's Food Distribution Program)25 kcal1.3 g
chopped tomatoes800 gFDC 170051Tomatoes, red, ripe, canned, packed in tomato juice128 kcal6.3 g
red lentils120 gFDC 174284Lentils, pink or red, raw430 kcal28.7 g
beef stock305 gFDC 172883Soup, stock, beef, home-preparedCalculated with FoodData Central's home-prepared beef stock. Bought stock and stock cubes carry more salt.40 kcal6.0 g
spaghetti360 gFDC 169736Pasta, dry, enrichedFoodData Central records dry pasta as one entry rather than by shape.1336 kcal46.9 g
Parmesan30 gFDC 170848Cheese, parmesan, hard118 kcal10.7 g
Whole recipeDivided by 63076 kcal209.0 g

Per serving the energy is rounded to the nearest 5 kcal, grams to the nearest whole gram and sodium to the nearest 10 mg. of which sugars could not be calculated, because one ingredient’s record does not cover it; the row above says which. Calculation method 1.0, September 2026. How the calculation works.

Storage and reheating

In the fridge
Cool, cover and refrigerate within 2 hours of cooking. The FDA chart gives cooked meat dishes 3 to 4 days.
In the freezer
The same chart gives cooked meat dishes 2 to 3 months in the freezer for best quality. Freeze the sauce without the spaghetti, which turns soft when thawed.
Reheating
Reheat until it reaches 74°C / 165°F, steaming hot throughout.

Checked against US Food and Drug Administration, Refrigerator and Freezer Storage Chart, USDA Food Safety and Inspection Service, Leftovers and Food Safety, FoodSafety.gov, Safe Minimum Internal Temperatures and FoodSafety.gov, Cold Food Storage Chart. UK guidance from the Food Standards Agency is shorter, at two days for most leftovers.

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