THORNTON, Colo. — Lars Obendorfer says he was “badly insulted” after he first began offering vegan sausage at his stands, dubbed “Best Worscht in Town.” He even found himself mediating between customers arguing on social media about what to him was just another menu item.

       “There was downright hostility between the meat eaters and the vegans,” he said. “And I just couldn’t understand it, and I said, ‘knock off the arguing.’”

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       That was six years ago.

       Today, his vegan currywurst — a take on the classic German fast food consisting of pork sausage with ketchup and curry power — is no longer a novelty but a menu fixture at his 25 stands across Germany.