In a blender or mini food processor, combine the yogurt, buttermilk, mayonnaise, 3 tablespoons of the cilantro, half of the scallions, the garlic, jalapenos, chipotle powder, 1/2 teaspoon salt and a few grinds of pepper. Process until smooth.
Put the coleslaw, the remaining 2 tablespoons cilantro and the remaining scallions in a large bowl. Add the dressing and toss to coat (add it in small increments, you may have more dressing than needed). |