A man notices that his wife always cuts a couple inches off each end of a joint of meat before seasoning it and putting it in the oven. When he asks her why she does that, she says it's what her Mom always did.
A couple of days later, she sees her mum and asks her why she cuts the ends off of a roast and her mother says it's because that's what her mother always did.
So then the woman goes to visit her grandmother and asks her why she always cuts the ends off her roasts, and the grandmother replies, "Because that's the only way it will fit in the roasting tin."
A couple of days later, she sees her mum and asks her why she cuts the ends off of a roast and her mother says it's because that's what her mother always did.
So then the woman goes to visit her grandmother and asks her why she always cuts the ends off her roasts, and the grandmother replies, "Because that's the only way it will fit in the roasting tin."