What they are: Polish dumplings filled with meat, cheese, and vegetables (aka potatoes)
Why they're the next ramen: Outside of the "Pierogie Pocket" swath of the US (frozen pierogi maker Mrs. T's describes it as "Pennsylvania, Ohio, Michigan, Illinois, New York, southern New England, and parts of the Mid-Atlantic region"), Poland's finest dumpling isn't a staple food. But that could change if more restaurants take the Pierogies Factory approach, by enabling the customer to customize both what they want inside the pierogi, like potato + cheese and pork, and outside of it, like caramelized onions + sour cream and the fusion-y green chile. And since America already loves it some potatoes and cheese, which also happen to be the main ingredients in cheese fries, it shouldn't take too long for this to catch on.
Places to eat them: The city of Pittsburgh, Mrs. T's Pierogies in your grocer's freezer, Denver's Pierogies Factory