01 - Set a grill pan or cast-iron skillet over medium-high heat and let it come to temperature.
02 - Lay the trimmed scallions across the hot pan. Cook without disturbing for 1–2 minutes, then turn occasionally, until deeply blistered and softened in spots, about 4–5 minutes total. Transfer to a plate and let cool completely.
03 - Once cooled, finely chop the scallions into small pieces, separating any tough root ends if needed.
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 the mixture is completely smooth and well blended.
05 - Add the chopped charred scallions and 2–3 tablespoons of chili crisp to the bowl. Fold gently until evenly distributed throughout the dip. Taste and adjust the chili crisp or salt as desired.
06 - Spoon the dip into a serving bowl. Drizzle additional chili crisp across the surface and sprinkle with chopped cilantro and toasted sesame seeds if using.
07 - Serve chilled or at room temperature alongside tortilla chips, crackers, crudités, or toasted baguette slices.