eclaire sammie

with a side of joint

That is not an eclair but a long john.
Long John (doughnut) - Wikipedia

Literally the first line

“A Long John (also known as a bar, éclair, or finger doughnut)”

I have never heard of an unfilled eclair. That idea is more offensive to me than this sandwich!

And to be fair, the Wikipedia entry for “eclair” makes no such provision for them to be unfilled, so I second calling this a Jong John until proof of filling can be made.