Korean Cod Fish Soup

Korean Recipes and How to make that: 

Ingredients:
1/2 lb. Daikon radish (white oriental turnip)
Sesame oil
1/4 tsp. crushed garlic
14 oz. cod fillets *
2 green onions (scallions)
1-1/2 tsp. salt
1/2 tsp. Sake (optional) **
1/4 tsp. soy sauce
Pepper
5 to 6 stalks watercress
Ground chile pepper (optional)
Directions:
Peel Daikon and cut into quarter rounds. In a medium saucepan, heat sesame oil and add Daikon and crushed garlic. Cook and stir 3-4 minutes. Add 4 cups of water and cook until Daikon is tender. Cut cod into bite-size pieces and add to pan. Heat just to boiling. Cut green onions into 2 inch slices and stir in. Season with salt, Sake, soy sauce and pepper. Tear watercress leaves and add to soup; remove from heat. Sprinkle with chile pepper, if desired.