UPDATE: This story was originally published on October 9.Flashback: You're in the grade-school lunchroom trading your PB&J for a bologna. Who knew simplicity could taste so good, right? Okay, now flash forward. You grew up — and so did your palate. Even so, you're never too old to enjoy a satisfying sandwich — but now, that carby creation you crave is a bit more complex. To satiate the lunchtime hunger, we've got 20 delicious sammies that we think are, well, the greatest thing since sliced bread.