Irish Mustard Sauce - cooking recipe

Ingredients

1 tablespoon cornstarch
2 teaspoons sugar
1 teaspoon dry mustard
1/2 teaspoon salt
1 cup water
1 tablespoon butter
1/4 cup cider vinegar
1 teaspoon grated prepared horseradish
2 egg yolks, beaten

Preparation

Combine cornstarch, sugar, mustard and salt in quart pan.
Add water.
Stir over low heat until mixture thickens and boils. Remove from heat; add butter, vinegar, and horseradish.
Beat a little of hot mixture into egg yolks; then add yolk mixture into pan.
Cook slowly, stirring until sauce thickens slightly. Serve.