Creamy Tomatillo Dressing

My mom gave me this recipe, it is a copy of a Cafe Rio dressing that I love. There are many versions of this circulating around and they are all delicious.

1 buttermilk ranch dressing packet
1/2 c buttermilk
1/2 c sour cream
1 c mayo
2 tomatillos, husk removed and diced (sold near jalapenos)
1/2 bunch cilantro
2-3 cloves garlic
juice of 1 lime
1 jalapeno

Place all ingredients in blender or food processor and blend until well mixed. Refrigerate for an hour before serving. Can be made thicker for a dip, or use as Mexican food sauce/topping or salad dressing.