one plate; one dish; one helping
Counts a single serving or dish of food, often in restaurant or home meal contexts.
One plate is enough for lunch.
このコースは一皿ずつ運ばれてくる。
In this course, each dish is brought out one by one.
一品 also means 'one dish' but is more formal and often used in menus or cooking contexts.
Compound of 一 (one) and 皿 (plate/dish).