Pelmeni, a Russian version of dumplings, is a widely popular convenience food in Russia. They are sold and kept frozen (or get frozen after being made at home) and then require only about 10 minutes of boiling to be ready for serving. Filling is always ground or minced meat with spices and herbs, and they can be eaten with basically any condiment. Most common are butter, smetana (sour cream), mayonnaise, and vinegar.
Here is how you can make pelmeni yourself:
Taken from https://www.youtube.com/watch?v=b8ing4Z1BPY