Rinse the lentils thoroughly.
Finely chop the onion, carrot, and celery.
Heat olive oil in a pot, then sauté the onion, carrot, and celery.
Add minced garlic and sauté.
Add lentils, canned tomato, vegetable broth, herbs, salt, and pepper.
Once it starts boiling, lower the heat and simmer for 25-30 minutes until the lentils are cooked.
Taste and adjust seasoning.
Serve in a bowl and garnish with herbs.