Ingredients

  • 14 ounces dried udon noodles
  • 2 tablespoons cornstarch
  • 4 eggs, beaten
  • 2 ounces mustard
  • 2 ounces baby mustard cress
  • 2 scallions or 2 spring onions, finely chopped
  • 1 inch gingerroot, peeled finely grated
  • 4 cups water
  • 1 12 ounces bonito flakes, see note
  • 1 12 tablespoons mirin
  • 1 12 tablespoons shoyu
  • 1 12 teaspoons salt

Method

  • Place water and soup ingredients in large pan bringing to boil over med heat.
  • When it boils remove from heat.
  • Let stand a minute then strain thru muslin.
  • Check taste, add more salt if needed.
  • Cook the Undo by heating 9 cups water in pan and cook for 8 minutes or according to package.
  • Drain under cold running water.
  • Wash off starch with your hands.
  • Leave in sieve.
  • Pour soup into large pan and bring to boil.
  • Blend the cornstarch with 4 tbsp water.
  • Reduce soup heat to medium and gradually add the cornstarch mix.
  • Stir constantly.
  • Soup will thicken after a few minutes.
  • Reduce heat to low.
  • Mix egg, mustard/cress and onions in small bowl.
  • Stir soup to create whirlpool.
  • Pour eggs slowly into soup pan.
  • Reheat Undon with hot water from kettle.
  • Divide between bowls.
  • Pour soup on top.
  • Garnish with ginger.
  • Serve hot.
  • Note use kezuri-bushi if you can find it.