Let's start by peeling 6 medium potatoes, washing them and boiling them for 15 minutes. I used 2 litres (0.5 Gallons) of water.
While the potatoes boil, dice an onion and fry it in some oil. Add 3 cloves of garlic towards the end when your onions are browning beautifully.
Chop your celery and if you have any other veggies like carrots, cauliflower or broccoli, chop these up too.
Add all the ingredients to the potatoes, add 1 tbsp salt, pepper and boil for another 15 minutes. You can add an extra liter of water (0.25 Gallon) of water at this point.
Take off the heat and using an immersion blender, blend all the ingredients or using a high powered blender (I recommend you let the soup cool for a while first) blend until smooth. I had to do this 3 times for the quantity.
Pour into mason jars and keep refrigerated for up to 10 days.