Asparagus with Tangy Mustard Dressing

1 pound fresh aspargus, trimmed and blanched, cooled and dried
1 teaspoon dried mustard
1 teaspoon hot water
1 egg yolk
1 tablespoon dark soy sauce
1 teaspoon finely chopped fresh ginger
1/4 teaspoon salt

Mix mustard and hot water together and stir into a thick paste. Add remaining ingredients and mix well. Pour over asparagus and serve within three hours.
from Asianvegetarianfeast (Hom)