01 - In a medium bowl, whisk together the sour cream, mayonnaise, and buttermilk until smooth and well blended.
02 - Fold in the finely chopped Grillo's pickles and pickle brine, stirring to distribute evenly throughout the base.
03 - Sprinkle in the ranch seasoning mix and stir thoroughly until fully incorporated.
04 - In a separate small bowl, combine the diced tomato, red onion, cilantro, jalapeño (if using), lime juice, salt, and pepper. Toss gently to combine.
05 - Fold approximately two-thirds of the pico de gallo into the creamy base, reserving the remainder for garnish.
06 - Transfer the dip to a serving bowl. 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, or serve immediately alongside tortilla chips, vegetable sticks, or crackers.