I love leek and potato soup as a quick dinner at work that I take in a flask.
I make it the lazy way though. I use Asda's pre cut leek and potato in a bag which is only £1.00, to it I add 2 knorr veg stock cubes, 2 garlic cloves, 1ltr of water and a red chilli. Bring to the boil and simmer for 20 mins then blitz with a blender. Absolutely delish and the chilli kick warms u up