From the New Laurel’s Kitchen Cookbook.
 Mock Sour Cream
 1 cup nonfat cottage cheese
 2 Tbls lemon juice
 2 Tbls fatfree mayonnaise
 1/4 cup nonfat buttermilk
 zest of 1/2 lemon (I usually omit this, it’s lemony enough without it to my
 Blend all ingredients in a blender until smooth.  This can be used in most
 recipes that call for sour cream.