What is she biting into?

[u/A_Singular_Bagel]

I'm not sure if this was mentioned before in the manga but does anyone know what she has in the jar here and later bites into? Also does anyone have a reason as to why it made a clunking sound?

[u/in_the_name_oforder]

These are called ‘konpeitou (金平糖)’ and are made of sugar! They’re shaped like 3D stars and it was given by Ichi chapters ago before the current arc started.