Lentil Soup with Dijon Mustard
Why this recipe works
- Simple aromatics, deeper flavour: Softening onion, carrot and celery before simmering gives the broth a rounded savoury base.
- Dijon lifts the broth: Stirring in mustard at the end adds gentle acidity and sharpness without overpowering the lentils.
- Good for batch cooking: The soup keeps well, freezes in portions and can be loosened with a little stock when reheated.
Get the most out of this recipe
Timing notes
- Let it stand briefly: A short rest off the heat helps the lentils settle and allows the broth to thicken slightly before serving.
- Serve hot: The mustard tastes best when warmed through gently, so serve the soup hot rather than letting it sit too long after finishing.
Ingredient notes
- Use green lentils: Green lentils hold their shape better than softer red lentils, giving the soup body and texture.
- Choose a good Dijon: Dijon mustard is central to the finish, so use one with a clean, sharp flavour rather than a sweet mustard.
- Fresh or dried thyme: Fresh thyme gives a brighter herbal note, while dried thyme works well if added sparingly.
Texture tips
- Keep the simmer gentle: A hard boil can split the lentils and make the broth cloudy, so maintain a steady, gentle simmer.
- Loosen if needed: Lentil soup thickens as it stands; add a little stock when reheating if you prefer a lighter broth.
Make-ahead tips
- Make in advance: Cool completely, then refrigerate in a sealed container for easy lunches or quick suppers.
- Freeze in portions: Portion before freezing so the soup defrosts evenly and can be reheated only as needed.
- Reheat gently: Warm in a saucepan over a low to medium heat, stirring occasionally and adding stock if the soup has thickened.
Equipment you'll need
Ingredients
Instructions
- Heat the olive oil in a large pot over a medium heat. Finely chop the onion, dice the carrot and dice the celery, then add them to the pot with the salt and pepper. Cook for 8 to 10 minutes, stirring, until softened but not browned.
- Rinse the lentils in a sieve, then add them to the pot. Add the bay leaves, thyme and vegetable stock, and bring to a gentle simmer. Cook for 30 to 35 minutes, stirring occasionally, until the lentils are tender and the broth tastes rounded.
- Fish out the bay leaves and thyme sprigs. Stir in the Dijon mustard and simmer for 2 minutes to let it meld into the soup. Taste and adjust seasoning with a little more salt and pepper if needed, then ladle into bowls and serve hot.
- Let the soup stand off the heat for 5 minutes so the lentils settle and the broth thickens slightly. Stir once more before serving.
Recipe notes
Serving suggestions
This recipe pairs well with:
Tips
- Keep the simmer gentle; a hard boil can break down the lentils and make the soup muddy.
- If the soup thickens too much as it stands, loosen it with a splash of vegetable stock and warm through gently.
- For anyone who is pregnant, elderly, or immunocompromised, choose a pasteurised Dijon mustard and serve the soup piping hot.
Substitutions
- Replace Dijon mustard with whole-grain mustard for a milder, more textured finish.
- Replace fresh thyme with dried thyme for a similar herbal note.
Storage
- Refrigerate up to 4 days
- Cool completely, then refrigerate in a sealed container. Reheat in a saucepan over a low to medium heat, stirring and adding a little vegetable stock if needed, until piping hot. Freeze in portions for up to 3 months and defrost overnight in the fridge before reheating.
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Recipe overview
- Servings: 2 servings
- Total time: 55min (15min active)
- Difficulty: Easy
- Cuisine: French
-
Allergens:
Celery Mustard
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