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Sonic to test “blended burger”

Chain to be first national quick service operator to test beef-mushroom blend

Sonic Drive-In is slated to be the first national quick service chain to test a “blended burger,” a beef-mushroom blend touted for being more healthful and less of a strain on the environment than conventional hamburgers.

The Sonic Slinger will be tested in several markets starting at the end of August for 60 days, according to Scott Uehlein, the Oklahoma City-based burger chain’s vice president of product innovation and development. It will contain between 25 percent and 30 percent

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