Jetée

Apologies for the delayed relay, but I fell into the void.
I didn't come out with an answer, tho, but I felt half-confident the beefy consumption came from In-N-Out.

I also tried a search for "fast food that uses sesame seed buns.", but it didn't help.

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Here's some humble pie for my futile effort to provide citations and appropriate indications. (it's inside the buns, this time.)

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As human beings, our greatness lies not so much in being able to remake the world (that is the myth of the Atomic Age) as in being able to remake ourselves.

—Mohandas K. Gandhi