ねばねば stickyness (my translation was ‘gloopy’)
The food which brought up this word I think was やまいいも. Pick it up with your chopsticks and watch it ooze off! Can you see the image?
Yesterday I had a thing in my soba called おもち and was exactly as you said.
The Japanese friend I was with said that it is a typical food for the beginning of the year.
Did you enjoy your mochi?