In the bowl of a food processor add the cheese, the lemon juice, garlic clove, mustard and the anchovies.
Turn the machine on and let it run for 15 to 20 seconds.
Add the oil and yogurt and let the machine run for another 15 seconds.
Refrigerate for up to 4 days.If you prefer to use anchovy paste here, a good rule of thumb is 1 anchovy fillet = 1/2 teaspoon anchovy paste.And for those of you who don't like anchovies, sure you can leave it out, but I think they make the dressing. Your choice!