Place the first 8 ingredients in a blender; process 15 seconds. Gradually add cilantro; process until smooth.
Combine 2 tablespoons water and yogurt in a small bowl, stirring with a whisk until smooth. Add cilantro mixture; stir well.
I love this recipe! I eliminate the pumpkin seeds, use olive oil instead of canola, and eliminate the feta (I just don't care for feta). It makes a wonderful Caesar salad.