01 - In a medium bowl, whisk together sour cream, mayonnaise, and buttermilk until smooth and fully incorporated.
02 - Fold in the finely chopped Grillo's pickles and pickle brine, stirring gently to distribute evenly throughout the base.
03 - Sprinkle in the ranch seasoning mix and stir thoroughly until the mixture is well blended and no dry pockets remain.
04 - In a separate small bowl, combine diced tomato, red onion, cilantro, jalapeño (if using), lime juice, salt, and pepper. Toss gently to mix.
05 - Reserve one-third of the pico de gallo for garnish, then fold the remaining portion into the creamy base until just combined.
06 - Transfer the dip to a serving bowl, top with the reserved pico de gallo and additional chopped pickles if desired. Chill for at least 30 minutes for best flavor, or serve immediately with tortilla chips, vegetable sticks, or crackers.