Durkee Famous Sauce Clone - cooking recipe

Ingredients

1/2 cup cold water
4 tablespoons cornstarch
2/3 cup malt vinegar
2 tablespoons salt
1/2 cup sugar
1 egg
4 tablespoons prepared mustard (French's preferred)
4 tablespoons butter, cut into tiny bits

Preparation

Whirl all ingredients in blender on high speed until smooth, about two minutes.
Transfer to top of double boiler and cook over gently boiling water, stirring often for 12 to 15 minutes or until thickened and smooth.
Replace mixture back into blender and whirl 30 seconds or until smooth, using high speed.
Refrigerate in covered container 24 hours before using.
Keep covered in the refrigerator for up to 3 months.