noun
service hatch; pass-through
A small opening or counter used to pass food and dishes between a kitchen and a dining area, common in restaurants, cafeterias, and home kitchens.
料理ができたら配膳口に置いてください。
Please place the dishes on the service hatch when they are ready.
この食堂の配膳口は広くて使いやすい。
The pass-through in this cafeteria is wide and easy to use.