margarine

margarine 発音mɑ́ːrdʒərən、
a butterlike product made of refined vegetable oils, sometimes blended with animal fats, and emulsified, usually with water or milk.

a substitute for butter, prepared from vegetable and animal fats by emulsifying them with water and adding small amounts of milk, salt, vitamins, colouring matter, etc

Spread some margarine on the bread.
パンにマーガリンを塗って。 

know the difference between margarine and butter
マーガリンとバターの違いを知って［が分かって・を理解して］いる

with a scrape of margarine
マーガリン一塗り

In a pan, melt butter or margarine add flour slowly, stirring continually.
鍋にバターかマーガリンを溶かしかき混ぜながら小麦粉を徐々に加えていきます。