From YavelWiki

Ingredients

• 1 cup bottled salsa verde (we use Herdez)
• 1 (0.4 oz) packet buttermilk ranch dressing mix
• 1/3 cup chopped fresh cilantro
• 1/3 cup sour cream (you can do regular or light)
• 1/3 cup plain greek yogurt
• 1 tsp. minced garlic
• 1/2 tsp. kosher salt
• 1 Tbsp. fresh lime juice
• 1/4 tsp cumin
• 1 Tbsp. sugar
• dash of tabasco

Instructions

Put all the ingredients in a blender and blend until smooth. Keep refrigerated.