YOU SAID:
He knows what side he likes his bread buttered
INTO JAPANESE
彼はバターを塗ったパンが好きな面を知っています
BACK INTO ENGLISH
He knows what he likes about buttered bread
INTO JAPANESE
彼はバターを塗ったパンの好きなところを知っています
BACK INTO ENGLISH
He knows what he likes about buttered bread
Well done, yes, well done!