YOU SAID:
I am eating a sandwich with cheese and mustard
INTO JAPANESE
チーズとマスタードのサンドイッチを食べています
BACK INTO ENGLISH
I'm eating a cheese and mustard sandwich
INTO JAPANESE
チーズとマスタードのサンドイッチを食べています
BACK INTO ENGLISH
I'm eating a cheese and mustard sandwich
That didn't even make that much sense in English.