The Romans were known for the thermopolium, a forerunner of the modern day restaurant.
Those small restaurants were much like corner bars (thermopolia). These thermopolia frequently had an L-shaped counter with inset jars to hold food and to keep it warm.
Above Street-side counter with clay pots (dolia) for food, Thermopolium at Pompeii.
From the setup and use we may as well accept that thermopolia as the first “fast-food” restaurants, an early version Burger King.
During the reign of terror by the Hun’s visiting Europe steak tartar was first introduced.