Rinse the lentils thoroughly and soak them.
Chop the onion, carrot, and celery finely.
Heat olive oil in a pot and sauté the vegetables.
Add minced garlic and continue sautéing.
Add the lentils and mix well.
Pour in water or vegetable broth.
Season with salt, pepper, bay leaf, etc.
Simmer over medium-low heat until the lentils are tender.
Remove the bay leaf, taste, and finish.