Horseradish has deep roots in world history ‘Bitter herb’ wakes up tastebuds in any number of dishes By Gretchen Mckay, Pittsburgh Post-Gazette Published: April 7, 2021, 6:05am Share: 7 Photos When mixed with sour cream, mayo and vinegar, grated horseradish root makes a spicy sauce for roast beef sandwiches. (Gretchen McKay/Post-Gazette) Photo Gallery PITTSBURGH – Condiments often play a role in elevating a dish’s flavor. Where would a hot dog be without that ubiquitous squirt of ketchup or a ham sandwich without a slather of mayonnaise? Then there’s horsera...