YOU SAID:
It's a piece of cake to eat supper with mushrooms.
INTO JAPANESE
キノコと夕食を食べるケーキです。
BACK INTO ENGLISH
It is a cake to eat dinner with mushroom.
INTO JAPANESE
キノコと夕食を食べるケーキです。
BACK INTO ENGLISH
It is a cake to eat dinner with mushroom.
That didn't even make that much sense in English.