It's so simple & easy for the life of me I don't know why our local restaurants can't get it right, the key is the Ribeye and the Cheez Whiz, if you veer off that course it won't taste right. In answer to Alan's review I beg to differ! I just watched a show that followed the making of these great sandwiches at both Pat's & Geno's and guess what?! The Provolone was added after the fact because of customer requests, not the Authentic cheese!!! Pat invented the sandwich and uses Cheez Whiz -- not slamming Alan but I got it from the source so do try the sandwich, you'll absolutely LOVE it! I use butter because that adds a depth of flavor you don't get with the olive oil. Use what you like!