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Burger King to rivals: Let's create burger mashup

Burger King's "Peace Day" burger proposal just got a whole lot beefier.

Following a rebuffed attempt by Burger King to collaborate with McDonald's on Peace Day, BK extended its offer to four more fast food chains Tuesday. Each chain had previously offered to collaborate with the burger giant.

Burger King invited Denny's, Wayback Burgers, Krystal and Giraffas to join in crafting a burger mashup. Its offer to McDonald's still stands.

Denny's has already accepted the offer.

Burger King began courting McDonald's last week, hoping to craft a "McWhopper" using ingredients from the McDonald's Big Mac and Burger King's Whopper.

McDonald's CEO Steve Easterbrook responded to the proposition on the restaurant's Facebook page writing, "We love the intention but think our two brands could do something bigger to make a difference."

BK appears to be going ahead with its Peace Day burger plans regardless of McDonald's involvement, having already started construction on the pop-up restaurant in Atlanta.

The chain noted that its original proposal still stands and McDonald's can take its time deciding to come on board.

Proceeds from the pop-up restaurant will be donated to Peace One Day, a nonprofit group seeking to raise awareness for the International Day of Peace.