Combine the base

• Pour the buttermilk and the lime mayonnaise into a mixing bowl.
• Add the sour cream and whisk until smooth.

Season the ranch

• Whisk in the ranch seasoning packet until fully dissolved.
• Stir in the chopped dill.

Chill

• Cover and refrigerate so the flavors meld and the dressing thickens.

Serve

• Stir well before serving as a dip or dressing, or use as a chicken marinade.