At 13:06, this version 2 translation of Koufuku Graffiti episode 9 mentions a bag that has absorbed the flavors of the oden but the previous version 1 translation from DeadFish describes this as a pouch of mochi that has soaked up the flavor of the oden. I preferred the v1 line as it better describes what the pouch/bag is. Even better would be explanation subtitles on the top of the frame that appear to describe the more obscure things, references, or inside jokes to us westerners.
Researching further, this bag is a Kinchaku (巾着, literally "pouch"): pouches of thin deep fried tofu (aburaage) filled with mochi and other ingredients, with the top tied with kanpyō. Also referred to as fukuro (袋, literally "bag"). One girl bites into this bag and goes all gaga. Mochi (餅) is a pounded glutinous rice cake and is a traditional food for the Japanese New Year. Just putting the mochi in the oden would cause it to melt and dissolve into the soup, hence the edible bag.

@Bat Guanno, two different translations by two different groups.
The translation for version 1 was provided by "Commie" while the translation for version 2 was provided by "Caffeine"
And one last thing, DeadFish are not a Fansub Group, they just re-encode mkv files into mp4 format. If you have a problem with the translation take it up to the groups themselves, not DeadFish :)