Is Impossible Pie Impossible?

A series about recipes that may seem odd or outmoded and yet we're curious to try!
“I'm going to make an Impossible Pie today,” I announced.
“What's an Impossible Pie?” asked my six-year-old son, just as I hoped he would for the purpose of writing this introduction. “Is it a pie that no one's ever made before?”
“No,” I said.
I was about to go on when my husband spoke up, “Well, when you think about it, every pie is a pie that no one's ever made before…"
There was a brief silence.
My son later guessed that an Impossible Pie must be "very, very hard [...]

