Wash and dice onion, carrot, potato, celery, and tomato.
Heat olive oil in a pot and sauté the onions until fragrant.
Add the remaining vegetables (carrot, potato, celery) and stir-fry for 2–3 minutes.
Add tomato and minced garlic, then continue to cook.
Pour in vegetable broth and add salt, then bring to a boil.
Simmer over medium-low heat for about 20 minutes until the vegetables are tender.
Season with pepper and your favorite herbs.