a pile of one type of food on which other food is arranged as a meal

roasted vegetables on a bed of rice 底下铺了一层米饭的烤蔬菜

Serve the beef on a bed of polenta with mushrooms and peppers.

Pile the avocados on a bed of lettuce.

You could serve the fish on a bed of lightly cooked greens.

See also: bed noun (BOTTOM)