Western-style cooking or dishes originating from Europe/America (Western cuisine).
留学中に本場の洋食をたくさん食べた。
I ate a lot of authentic Western food while studying abroad.
洋食レストランでステーキを注文した。
I ordered a steak at a Western-style restaurant.
彼はフランスの伝統的な洋食に詳しい。
He knows a lot about traditional French Western cuisine.
Japanized Western-style dishes (yoshoku) — Western-origin dishes adapted to Japanese tastes (e.g., omurice, hamburger steak, curry rice).
子どもの頃は母の作る洋食（オムライスやハンバーグ）が大好きだった。
As a child I loved the yoshoku my mother made (omurice and hamburger steak).
この店のカレーは伝統的なインド風でなく、日本の洋食寄りだ。
The curry at this place isn't traditional Indian-style; it's closer to Japanese yoshoku.
洋食屋へ行ってハンバーグ定食を頼んだ。
I went to a yoshoku restaurant and ordered a hamburger-steak set meal.