Basic Vegetable Broth

The easiest, least ingredient-intensive vegetable broth I have ever found.
Gourmande Tartine
(For 1.5 quarts broth)

You need:

• 2 Tbsp olive oil
• 1 onion
• 1 garlic clove
• 5 to 6 coriander seeds
• 5 to 6 fennel seeds
• 2 to 3 thyme twigs
• A few peppercorns
• 1 fennel bulb, cut in big pieces
• 1 leek, cleaned and sliced
• 2 carrots
• 2 celery branches
• Salt
• 6 cups water

Steps:

• Peel the vegetables and cut them in big pieces.
• In a large stockpot, heat the olive oil and add the onion, garlic and spices. Cook for a few min, without browning.
• Add the vegetables and cook on medium to low heat for 10 min, until soft.
• Add the water and season with salt. Cover and bring to a simmer, and cook for 20 min. Remove from the heat and let rest for a few hours (or even overnight in the fridge) for the flavors to develop even more. Strain the broth and use when needed. It keeps well in the fridge for a few days.