YOU SAID:
i want a fish with potatoes
INTO JAPANESE
ジャガイモ入りの魚が食べたい
BACK INTO ENGLISH
I want to eat fish with potatoes
INTO JAPANESE
ジャガイモと一緒に魚が食べたい
BACK INTO ENGLISH
I want to eat fish with potatoes
That didn't even make that much sense in English.