01 - Set a grill pan or cast-iron skillet over medium-high heat and allow it to become smoking hot.
02 - Lay the trimmed scallions across the hot pan. Cook without disturbing for 1–2 minutes, then turn occasionally, until deeply blistered and softened with dark char marks, about 4–5 minutes total. Remove from the pan and set aside to cool.
03 - Once cooled, finely chop the charred scallions into small, even pieces. Set aside.
04 - In a medium mixing bowl, combine the sour cream, softened cream cheese, mayonnaise, grated garlic, soy sauce, toasted sesame oil, lime juice, kosher salt, and black pepper. Stir vigorously until completely smooth and well blended.
05 - Add the chopped charred scallions and 2–3 tablespoons of chili crisp to the dip base. Fold gently until evenly distributed throughout. Taste and adjust the chili crisp and salt levels as desired.
06 - Transfer the dip to a serving bowl. Drizzle additional chili crisp over the surface in a generous swirl, then sprinkle with chopped fresh cilantro and toasted sesame seeds if using.
07 - Serve chilled or at room temperature alongside tortilla chips, crackers, crudités, pita, or toasted baguette slices.