YOU SAID:
I like ketchup in my ice cream
INTO JAPANESE
私はアイスクリームのケチャップが好きです
BACK INTO ENGLISH
I like ice cream ketchup.
INTO JAPANESE
私はアイスクリームケチャップが好きです。
BACK INTO ENGLISH
I like ice cream ketchup.
That didn't even make that much sense in English.