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Sonic Drive-In rolls out mushroom-blended burger nationwide Sonic Drive-In

Sonic Drive-In rolls out mushroom-blended burger nationwide

Signature Slinger starts under 350 calories

In a first for national quick-service chains, Oklahoma City-based Sonic Drive-In said Thursday it would roll out a lower calorie, environmentally friendlier burger in which part of the beef in the patty is substituted with mushrooms.

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