How to Make It
In a spice grinder, pulse the mustard seeds with the five-spice powder, pepper, turmeric, cayenne and bay leaf until fine. Transfer the spice powder to a medium bowl. Add the ginger, garlic and yogurt and season with salt. Add the chicken and turn to coat. Refrigerate for 2 hours.
Light a grill. Remove the chicken from the marinade and brush the pieces with the melted butter. Season with salt. Oil the grate and grill the chicken over high heat, turning occasionally, until lightly charred and cooked through, about 8 minutes. Serve with the Cilantro and Yogurt Sauce.