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


Place all ingredients as listed in blender on high speed until smooth (2 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. Once more put mixture back through blender 30 seconds or until smooth, using high speed. Refrigerate in covered container 24 hours before using. Keep refrigerated 3 months.
Source: Gloria Pitzers' Make Alike Recipes.