Updated: Feb 27, 2019
This will be the base for every soup recipe here and can also enrich many other dishes. I will propose a simple option but would start by explaining the principle:
It is made by extracting flavor from different vegetables and herbs by boiling them in water for an hour. The water then get a general flavor that goes well with almost anything. The most basic ingredients are celery, onion, garlic, carrot and parsley, but I like to add cilantro, thyme and leeks but the list of what you can add is endless. I recommend putting them whole and unpeeled to extract maximun flavor from each.
You can make the broth in the biggest pot you have and freeze for up to a month what you don't use today. Also try put some in ice trays, you will get little cubes of flavor to be used in every day cooking.
Let's get to work:
for about 4-5 liter of water
1 garlic head
1 bunch parsley
1 bunch thyme
1 bunch cilantro
Boil everything in a big pot for an hour, separate the water from the vegetables.