ATLANTA (CBS) — Burger King is calling for a ceasefire in the “burger wars.”

The fast food chain is reaching out to McDonald’s to propose a one-time, one-place collaboration that would combine the signature sandwiches of each restaurant into something unique – The McWhopper.

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“All the tastiest bits of your Big Mac and our Whopper, united in one delicious, peace-loving burger,” Burger King writes in an open letter that ran in newspapers Wednesday.

Burger King says it was inspired to extend the olive branch by “Peace One Day,” a group pushing for an “annual day of global unity” on Sept. 21.

The proposed "McWhopper" packaging (Image credit

The proposed “McWhopper” packaging (Image credit

On that day, Burger King says it would open a pop-up restaurant with McDonald’s somewhere in Atlanta to serve the McWhopper.

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So far, there’s been no response from McDonald’s.