Craving all the potato-based comfort food this time of year? Let us introduce you to one of the heartiest hybrids on the pub scene: Irish nachos. Invented in 1980 at J. Gilligan’s Bar and Grill in Arlington, Texas, Irish nachos are the result of some early experiments with the restaurant’s first fryer. While serving up a batch of cottage fries in a skillet, the owner decided to layer the hot potato rounds with nacho toppings like cheese, tomatoes and jalapeños —and thus a bar food star was born. Forty years later, those humble spuds have earned national fame, and are now begging for a spot next to your favorite stout….