Cut the radish and beef into bite-sized pieces.
Add sesame oil to a pot and stir-fry the beef.
Add the radish and continue to stir-fry, then pour in the water.
When the soup starts to boil, skim off the foam.
Season with minced garlic, soy sauce for soup, and salt.
Boil until the radish is tender.
Slice green onions, add to the soup, and bring it to a final boil.