oops! Sorry. It’s a recent parody/homage/whatever of the poem:

-This is just to say

-I have eaten -the rich -that were at -the golf club

-and which -you were probably -saving -for class war

-Forgive me -they were delicious -so white -and so old

It was posted on Twitter by “your friend Helen” (@hels) many years back. I assume they were the author but I really don’t know.