Pittsburgh is not known for setting culinary trends, but some restaurant operators in the area are well ahead of the curve. Eat’n Park, a 79-unit family-dining chain based there, rolled out espresso machines in 2003, shortly after improving the quality of its drip coffee. It switched to canola oil with zero grams of trans fat back in August 2005. When local produce is in season, some of it can be found on the salad bars of this chain, which has a check average of just $7. Eat’n Park started ...

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