New York (CNN Business) Burger King's test of a vegetarian version of its signature Whopper was such a success, the chain is planning to roll the Impossible Whopper out nationally this year.

Restaurant Brands International QSR On April 1, Burger King started testing the vegetarian burger , using a plant-based patty from Impossible Foods . The test took place in St. Louis and "went exceedingly well," a spokesperson for, Burger King's parent company, said. The spokesperson added that the sales of the Impossible Whopper are complementary to the regular Whopper.

That's exactly what Burger King wants.

With the Impossible Whopper, Burger King is primarily targeting meat eaters who seek more balance in their diet. The new product is designed to "give somebody who wants to eat a burger every day, but doesn't necessarily want to eat beef everyday, permission to come into the restaurants more frequently," Chris Finazzo, president of Burger King North America, told CNN Business when discussing the initial test.

Burger King started testing out the Impossible Whopper in St. Louis.

The Impossible Whopper is supposed to taste just like Burger King's regular Whopper. Unlike veggie burgers, Impossible burger patties are designed to mimic the look and texture of meat when cooked. The plant protein startup recently revealed a new recipe, designed to look and taste even more like meat. That version is being used in Burger King's Impossible Whoppers.

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