Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
1         cup           fat-free mayo (Kraft works well)
*1        cup           fat-free sour cream 
4         Tablespoon    dijon mustard, or to taste
1         cup           Splenda sweetener, or to taste
1/2       cup           red wine vinegar
2         Teaspoon      pepper

*1/2 cup plain nonfat yogurt may be substituted for sour cream if desired.

Preparation:

Mix all above ingredients together. Store unused portion in airtight container in refrigerator.