"I love my ice cream. I always found on a Friday night you'd earned it for the week. It got me ready to go."
So which flavour was the obvious follow-up question.
"I quite enjoy mint-choc chip. But with an apple crumble the night before a game a bit of vanilla used to be pretty perfect," McCaw added.
Carter said the All Blacks flanker and captain could get quite pent up if there was no ice cream available the night before a test.
"I did find it quite amusing when you'd absolutely tear off at the dietician or the hotel staff because there wasn't ice cream," Carter joked.
"It would completely ruin your preparation and as every professional athlete knows – preparation is the key. And that was a big part of Richie's preparation and you did not want to mess with that."
Part two of the McCaw interview will be released on Dan Carter's official Facebook page on Thursday. Next week he will chat with South African World Cup winning captain Siya Kolisi.