How to Make It
In a small bowl, use a fork to blend the chicken stock with the sherry, soy sauce and cornstarch.
Heat 1 tablespoon of the oil in a large skillet. Add the cashews and cook over moderate heat, stirring, until lightly browned, about 1 minute. Using a slotted spoon, transfer the nuts to a plate.
Heat the remaining 1 tablespoon of oil in the skillet. Add the white part of the scallions, the ginger, garlic and Szechwan peppercorns and cook, stirring, for 1 minute. Add the sauce and arrange the chicken in a single layer in the skillet; season with salt and pepper. Arrange the bok choy in a layer over the chicken. Cover and cook until the chicken is cooked through and the bok choy is tender, 5 to 7 minutes. Transfer the chicken, bok choy and sauce to bowls. Garnish with the scallion greens and cashews and serve with rice.