Tangy and spicy, and cool and creamy - this dressing is at its peak of deliciousness if served the same day that it's made.
I have the full recipe of you're serving a group, and a smaller version if you are making this for lunch for just a couple of people.
Note on xanthan gum: This is totally optional, but it helps emulsify the dressing and keep it from separating. It can be eliminated. Just shake or whisk the dressing before serving.
Smaller recipe (makes about ¾ cup, which serves 2-3 people):
4 teaspoons dry ranch dressing mix
⅓ cup buttermilk
5 tablespoons mayo
¼ cup chopped cilantro leaves
⅛ teaspoon garlic powder
1 teaspoon chopped jalapeño
2 teaspoons lime juice
about ¾ of one small tomatillo (husk removed)