Reheat the 4 vol-au-vents cases for 5 minutes in the oven. Place a pastry case on each plate and fill until slightly overflowing.
Serve immediately on its own or with pilau rice, for example.
Remarks
The vol-au-vent was invented by the great chef Antonin Carême in the early 19th century.
I maintain (admittedly with a certain caution) that the French "bouchées à la reine" (literally, the Queen's mouthfuls) are simply small, bite-sized vol-au-vents.