Creamy Tomatilla Dressing

We have several restaurants out here that serve their salads with the most amazing tomatilla dressing and it never seems that they give you enough. Some time ago, my friend Michelle found this recipe and it's pretty close. Close enough, anyway, that I can make it at home and be extremely happy and satisfied.

Ingredients:
1 packet Hidden Valley Ranch Buttermilk dressing
1 cup buttermilk
1 cup mayo
3 tomatillas (they look like green tomatoes)
2 cloves of garlic
1 cup fresh cilantro
1/2 tsp. cayenne pepper

Directions:
Blend all ingredients in the blender. Refrigerate.