Peel & chop onions into quarters. Pop in a roasting tin and brush with the melted butter or oil, then splash with the Balsamic vinegar. I probably used a couple of tablespoons of it over the onions (don't worry if you haven't cooked with this stuff before, your soup won't taste vinegary - I promise!)
Roast gently, at about Gas 2/150c/300f for an hour to an hour & a half.
The onions want to be juicy & browned, but not burnt. Cover with foil halfway through if they are looking too well done.
Meanwhile, cook the chopped potato in the water or stock, keeping a lid on to prevent the stock steaming off.
When the potato is soft and the onions are juicy, mix together in the saucepan & blitz with a stick blender, or let cool a little and tip into a jug blender. Whizz till fine and smooth.
Season with the salt, and a pinch of chilli powder wouldn't hurt if you needed extra warming up.
Superfood Soups – Balsamic Roast Onion
Amount Per Serving
% Daily Value*
Saturated Fat 0g0%
Vitamin C 19.1mg23%
* Percent Daily Values are based on a 2000 calorie diet.