Ritsuko got "Amish Friendship Bread" from her friend.
That is kind of cake bread and, it needs to care 10 days before making it.
After 10 days it will be quartering original one.
One is used to make bread and the rest of three are given to friend.
It was just 10 days from her getting yesterday, so Ritsuko tried to make it and pretty tasty.
She presented three of the rest to her friend today.