siemond chan March 15, 2013 11:00 AM
Pumpkin spice lattes in the fall. Heart-shaped donuts at Valentine’s Day. And of course, in time for St. Patrick’s Day this weekend, McDonald’s famous Shamrock Shake. These food items don’t hold permanent spots on the menu, but rather are part of the fast-food industry’s “limited time offer” strategy meant to lure customers in for here-today-gone-tomorrow offerings.