Lentil and Potato Soup

4 November 2026

Lentil and Potato Soup

Red lentils are one of the cheapest things you can eat. A 500g bag costs around £1.10 from Tesco or Asda and you only need 150g for this soup, which feeds six people. Add a couple of potatoes and a carrot and you have a full meal for just over a pound.

This soup is thick enough to stand a spoon in. The lentils break down as they cook, giving it a creamy texture without any actual cream. Blending half of it smooths things out while keeping some texture from the potato and carrot.

It freezes perfectly, so it is worth making the full batch even if you are cooking for one. Six portions in the freezer means six lunches that cost less than 20p each and take 3 minutes in the microwave.

Total cost: £1.08 (£0.18 per portion) – Serves 6 bowls. Prep: 10 mins | Cook: 25 mins

Lentil and Potato Soup

A thick, warming soup made with red lentils and potatoes. Costs about 18p per bowl and freezes brilliantly for batch cooking.
Prep Time 10 minutes
Cook Time 25 minutes
Servings: 6 bowls
Course: Lunch, Main Course
Cuisine: british

Ingredients
  

  • 150g red lentils, rinsed
  • 2 medium potatoes, peeled and diced
  • 1 large onion, chopped
  • 2 cloves garlic, crushed
  • 1 carrot, diced
  • 1 tbsp vegetable oil
  • 1 litre vegetable stock (1 stock cube)
  • 1 tsp ground cumin (optional)
  • 1 pinch salt and black pepper

Method
 

  1. Heat the oil in a large saucepan over a medium heat and fry the onion for 5 minutes until softened.
  2. Add the garlic and carrot and cook for 2 more minutes, stirring so the garlic does not burn.
  3. Stir in the red lentils, diced potato, cumin (if using), salt and pepper.
  4. Pour in the vegetable stock and bring to the boil, then reduce the heat and simmer for 20 minutes until the lentils and potatoes are tender.
  5. Blend half the soup with a stick blender or transfer half to a blender and back, leaving it partly smooth and partly chunky.
  6. Taste and adjust the seasoning, then serve hot with bread if you have it.

Tips and Variations

Red lentils do not need soaking, just a quick rinse under the tap to remove any dust. If you do not have a stick blender, a potato masher works too – just mash it roughly in the pan for a more rustic texture. A squeeze of lemon juice at the end brightens the flavour if you have one handy.

Is it cheaper to make this from scratch? Use our Cook vs Buy Calculator to compare the real cost of homemade vs shop-bought.

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