And this is why we LOVE Ed Sheeran.  The English singer served Philly cheesesteaks to his fans in South Philadelphia Saturday while in town for his Mathematics Tour.    Fans immediately lined up at SQ Philips Steaks when Ed posted the address and said that cheesesteaks were on him.   Of course, he got a quick tutorial from the owners on how to make the perfect sandwich with “slabs” of melted Cheez Whiz before he took over as cook and server.