Durkee's Famous Sauce

Ingredients:

• 1/2 cup cold water
• 4 tablespoons cornstarch
• 1/2 cup plus 2 tbs dark vinegar
• 2 tablespoons salt
• 1/2 cup sugar
• 1 whole egg
• 4 tablespoons French's prepared mustard
• 4 tablespoons margarine -- tiny bits
  

Directions:

1. Place all ingredients as listed in blender on high speed until smooth (2 minutes).
2. Transfer to top of double boiler and cook over gently boiling water, stirring often for 12 to 15 minutes or until thickened and smooth.
3. Once more put mixture back through blender 30 seconds or until smooth, using high speed.
4. Refrigerate in covered container 24 hours before using.
5. Keep refrigerated 3 months.