"When literally anything would be better on a bun than their beef," Wendy's tweeted.
The two fast-food companies have feuded on Twitter in the past as brands have become more savvy building excitement for their products on social media. Popeyes has racked up followers promoting its chicken sandwich and taking shots at rival Chick-fil-A.
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Wendy's continued to pile on Burger King after the initial tweet.
"Please tell me this is a joke," one user replied.
"Their whole restaurant is," the chain responded.
Reviewers in New Zealand were split on the sandwich idea, which is known there as a butty.
"Honestly, I thought this butty was kind of great," one reviewer said. "It had a good amount of mayo and sauce and a cross-section revealed an evenly distributed amount of chips."
"I thought this would spoil my lunch but instead it spoiled my day," another said. "I can't believe I’m saying this, but it's not even worth $2."