To freeze uncooked pelmeni, space them out on a floured tray and freeze until firm, then transfer to bags. Keep at −18°C (0°F) or below for up to 3 months for best quality. Boil without thawing, allowing extra time as needed for the filling to reach 74°C (165°F). Put cooked leftovers in shallow containers and refrigerate at 4°C (40°F) or below within 2 hours, or within 1 hour if the temperature is above 32°C (90°F). Eat within 3–4 days and reheat the centre of the filling to 74°C (165°F).