YOU SAID:
We are having beef for supper only
INTO JAPANESE
私たちは夕食のためだけに牛肉を持っています
BACK INTO ENGLISH
We have beef only for dinner
INTO JAPANESE
私たちは夕食のみの牛肉を持っています
BACK INTO ENGLISH
We have beef only for dinner
That didn't even make that much sense in English.