Chop all the vegetables into bite sized pieces of a roughly even size, if you haven’t already.
Heat the 40-60ml oil in a large soup pot over a medium heat. Once shimmering, add the chopped ginger and cook for a minute or so until fragrant. Stir frequently to prevent it sticking.
Add the vegetables and stock to the pot and stir to combine. I like to add stock conservatively to start, then add more as I assess the consistency later.
Place the lid on and cook for around 15-25 minutes or until all the vegetables are thoroughly cooked through. This will depend on whether you roasted the vegetables, how finely you chopped them and the heat you are using. Stick a knife through the largest piece of potato to confirm the vegetables are cooked through.
Use an immersion blender (soup stick) to blend the soup until smooth. Add the seasoning to taste, followed by maple syrup or brown sugar if the soup isn’t quite sweet enough. When you are happy with the taste, stir in any finishing ingredients you plan to use (they are optional).
If you find the soup has a potato soup consistency, take a portion and blend it briefly. This will change the starch molecules in the potato and give the soup a thick and creamy texture. Experiment with how much you blend, but do if briefly and don’t blend the entire batch of soup. If you have a blender without a steam valve, you will need to blend the soup after it cools.
Store leftovers in an airtight container in the fridge. They will thicken a little, so add a splash of milk or water to the thin the leftovers to your desired consistency if needed.