This one here:
http://www.toomanychefs.net/archives/002039.php
1/2 a pot of low fat plain yogurt
1 large handful of fresh basil leaves
1 clove of garlic
4 small spring onions
1/2 a small tin of anchovies (If you are an anchovy lover and use the remainder to garnish your salad it will only add one point - or use a couple of them to garnish the sauce if you are making a crudités dip. I like to warn guests about the presence of anchovies in this way when we have people over for dinner or drinks!)
2 teaspoons lemon juice
Rinse the anchovies and add them, along with the rest of the ingredients, to a mini-blender or mini-food processor. Whizz on high until smooth. Taste for seasoning: it may need a little more lemon juice or a dash of pepper. It probably won't need salt. It will need to be consumed immediately. Enjoy!