I heard a similar one, about a woman who had learned from her mother always to cut the ends off the roast before putting it in the oven. One day, teaching her daughter about how to cook a roast, her daughter asked why, and she realized she didn't know - so she went to her mother.
Her mother said, "I always thought it was for the taste, but I learned it from your grandmother; we should ask."
So they asked the grandmother, who said, "Oh, when your father and I got married, all we had was a very small roasting pan, so I cut off the ends of the roast so it would fit."
Her mother said, "I always thought it was for the taste, but I learned it from your grandmother; we should ask."
So they asked the grandmother, who said, "Oh, when your father and I got married, all we had was a very small roasting pan, so I cut off the ends of the roast so it would fit."