Can I substitute gelatin for aspic?
Aspic is a type of stock which is high in gelatin, and which sets into a jelly when cooled. Unflavored gelatin will have basically the same mechanical properties as aspic, as long as the gelatin concentration is roughly the same (1/2 tbsp of dry gelatin will set about a cup of liquid). But the taste will be very different, of course: Aspic tastes like whatever it's made from, and unflavored gelatin will taste like nothing. So if you plan to use gelatin, it would be best to use stock instead of water when making it.