YOU SAID:
Pepperoni pizza is pizza with pepperoni on it.
INTO JAPANESE
ペパロニのピザは、それにペパロニが入ったピザです。
BACK INTO ENGLISH
Pepperoni's pizza is a pizza with pepperoni in it.
INTO JAPANESE
ペパロニのピザは、その中にペパロニが入ったピザです。
BACK INTO ENGLISH
Pepperoni's pizza is a pizza with pepperoni in it.
Come on, you can do better than that.