What they are: Small dumplings filled with meat, mushrooms, and/or other fillings wrapped in a thin, flour-based dough. Variations exist throughout Russia.
What's the deal: Pelmeni are kind of like a cross between Chinese jiaozi and Polish pierogies, are extremely common, and were initially popular because they stayed preserved when frozen and, well, everything in Russia is kind of frozen for a good part of the year. They're also super easy to cook… just boil the frozen ones, and they plump right up. So yeah, this is kind of like the proto frozen food. Totino's owes them a debt of gratitude.