text:  This is Morning Edition from NPR News. I'm Layla Fulton. And I'm Stephen Skeap. In addition to the birthday of America, the Caesar salad is 100 years old today. NPR's Netta Ulaby brings us the noble Caesar's history. In the kitchen of an uptown restaurant in New Orleans, a chef in black T-shirt and jeans is prepping a grilled Caesar salad.