Unusual ingredients

I had class last night and while correcting my kids homework I came across some interesting sentences. They have to copy sentences into their notebook from their folder. The sentences were:

He was helping Grandma.
She was listening to the radio.
They were cooking supper.

And in one student’s notebook, I got:

She was listening supper.
He was helping radio.

And the best one!

They were cooking Grandma.

Um….ouch?