YOU SAID:

If I could wish for just one dish, that dish I'd wish, would be for fish

INTO JAPANESE

私がたった一つの料理を望むなら、私が望むその料理は魚用だろう

BACK INTO ENGLISH

If I want only one dish, that dish I want will be for fish

INTO JAPANESE

私が1つだけの料理が欲しいなら、私が望むその料理は魚のためになります

BACK INTO ENGLISH

If I want only one dish, that dish I want will be for fish