April 10, 2015 3:15 pm The Perfect Burger Takes 40 Days The 40 day dry-aged burger is like a steak on a bun. Get a taste at David Burke’s Primehouse in Chicago. US & World Videos 5:49 Kelly Clarkson hilariously attempts handmade pasta with chef Evan Funke 1:36 O.J. Simpson's cause of death revealed 2:03 Does Shakira still believe in love following Gerard Piqué split? 2:36 Super dad makes Mario-themed obstacle course for son's birthday 1:59 Ellen DeGeneres jokes about being ‘kicked out of show business'