Sam O'Sullivan's Boxing Day BBQ traces the origins of the Christmas holidays to the present, and questions whether we need to let go of old ways of thinking that no longer us or the planet.

It's Sydney. It's Boxing Day. And it's stinking hot. Grandad Stephen was the family's BBQ king and his adult children have gathered to honour his memory. Wine snob Peter and cynical Connie reluctantly get the clan together for round two of festivities – they've survived the chaos of Christmas but Boxing Day is set to pack a punch. In raising a toast to Stephen's memory, old grudges and family tensions sizzle to the surface. Surely they'll be able to stop grilling each other for one day.