01 - Set a grill pan or cast-iron skillet over high heat and allow it to become ripping hot, approximately 3–4 minutes.
02 - Lay the trimmed scallions across the hot pan in a single layer. Cook without disturbing for 1–2 minutes, then turn occasionally until deeply blackened and blistered in spots, about 3–4 minutes total. Transfer to a plate and let rest until cool enough to handle.
03 - Roughly chop the charred scallions into small pieces, retaining as much of the smoky char as possible. Set aside.
04 - In a medium mixing bowl, combine the sour cream, Greek yogurt, mayonnaise, minced garlic, soy sauce, toasted sesame oil, kosher salt, black pepper, and lime juice. Whisk or stir until smooth and homogeneous.
05 - Add the chopped charred scallions and 2 tablespoons of chili crisp to the bowl. Gently fold everything together until the scallions and chili crisp are evenly distributed throughout the dip.
06 - Taste the dip and adjust with additional salt or lime juice as needed to balance the richness and heat.
07 - Spoon the dip into a serving bowl. Garnish with a generous swirl of extra chili crisp and a scatter of sliced scallion greens. Serve chilled or at room temperature alongside tortilla chips, crudités, pita, or grilled meats.