Cut vegetables into a bite-size, no larger than 3/-4-in.
In a soup stock pot in heated oil sauté’ onions until they become translucent; then add the other vegetables and sauté’ 3 more minutes.
Add water and boil until all the vegetables are soft; reduce heat to simmer and add miso paste.
Bring to a simmer and garnish with chopped leeks or sliced green onions.