Move over, Pat’s and Geno’s. Philadelphia’s sliced-and-diced meat-and-cheese concoction faces a more sustainable, animal-friendly competitor — the vegan cheesesteak. So, where’s the “beef”? Typically, it’s thinly sliced seitan. Made from wheat, seitan was developed in China about 1,500 years ago and enjoyed by vegetarian Buddhist monks. Today, seitan has gained popularity among vegans, who do
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