YOU SAID:

I like eating hotdogs with mustard on them.

INTO JAPANESE

マスタードを添えたホットドッグを食べるのが好きです。

BACK INTO ENGLISH

I like eating hot dogs with mustard.

INTO JAPANESE

マスタードでホットドッグを食べるのが好きです。

BACK INTO ENGLISH

I like eating hot dogs with mustard.