01 - In a medium bowl, whisk together the sour cream, mayonnaise, and buttermilk until completely smooth and free of lumps.
02 - Fold in the finely chopped Grillo's pickles along with the pickle brine, stirring gently to distribute evenly throughout the base.
03 - Add the ranch seasoning mix to the bowl, stirring thoroughly until all the spices are well incorporated and no dry pockets remain.
04 - In a separate small bowl, combine the diced tomato, red onion, cilantro, jalapeño if using, lime juice, salt, and pepper. Toss gently to mix all ingredients evenly.
05 - Reserve about one-third of the pico de gallo for garnish, then gently fold the remaining two-thirds into the creamy dip base until just combined.
06 - Transfer the dip to a serving bowl and top with the reserved pico de gallo and additional chopped pickles if desired.
07 - Refrigerate for at least 30 minutes to allow the flavors to meld together, then serve with tortilla chips, fresh vegetable sticks, or crackers.