Christmas centrepiece:Whole-roasted spice-rubbed cauliflower sitting on romesco.Katrina MeyninkThis spiced nutty cauliflower makes for Christmas Day greatness. Incredibly easy,all it needs is a shove in the oven and get-on-with-it sort of planning – perfect for the mayhem that often ensues at Christmas. You can make the romesco ahead of time if you want less to do on the day. Just warm through before serving.