Green Goddess Salad Dressing

1 cup fresh, snipped parsley
1 small or 1/2 medium onion, chopped
1 cup plain low-fat yogurt
1/4 cup low-fat mayonnaise
2 tablespoons lemon juice or vinegar
1 teaspoon salt or garlic salt

Blend smooth in a covered blender. Cover; refrigerate.

Makes 1 3/4 cups. About 15 calories per tablespoon.