りょうり means a "prepared meal." When you attach a country name in front of it, it specifies the nationality of the dish (i.e. にほん りょうり, フランス りょうり, メキシコ りょうり, etc.).
ちゅうか りょうり (Chinese dish), however, is slightly different. China is ちゅうごく, and ちゅうか means "of China." Some people say ちゅうごく りょうり, but ちゅうか りょうり is more common. |