Heat oil in a casserole over medium heat. Cook the leeks, onion, carrot, and celery for 2 to 3 minutes.
Add garlic and curry. Stir.
Add broth, barley, and herbs. Bring to a boil. Cover and simmer for 25 minutes at low heat. Rinse lentils under cold water, then add them to the soup with seasoning. Simmer at medium-low heat for 15 to 20 minutes.
Cool down, then refrigerate. Divide the preparation into hermetic containers. This dish may be kept in the freezer for 4 months.
If desired, thaw this soup the night before eating.
To reheat, heat this soup in a casserole at medium-low heat until it boils.
Did you know that...
Leeks have a high fibre content, which helps regulate intestinal function.