
The downside to burdock is its slightly bitter taste. It is known that sweet, bitter, and umami are used by the same taste receptors in the tongue, so I figured adding sweet elements to the soup would counter this bitter taste. I caramelized the onions in a pot before adding anything else to the soup, which enhances the onions' natural sweetness.
750 mL water
250 mL milk
Enough bouillon for 500 mL soup
2 large potatoes
1 large carrot
3 celery sticks
1 long burdock root
2 large onions
3 green onion sticks
Put the vegetables in the pot in the following order, with a minute or two between each ingredient:
onions -> carrots -> green onions -> celery -> burdock root -> potatoes
Simmer in low heat for 20 minutes, and then add milk.
Simmer 20 more minutes in low heat and serve.