I wanted a soup recipe which used leeks but not potatoes and as there appeared to be none available I invented my own. Is now one of my favourite as the flavour can be altered by just adjusting the amount of each ingredient. Don't be put off by the colour, which could be a deep green if you use the green end of the leek and a green pepper - or a paler green if you used the white end of the leek and half and half peppers.