Programme advertisement for the Cornish chemist T.B. Percy Ltd

The advertisement promotes Percy’s Rennet as ‘the best rennet obatainable’ to make an irresistable Junket with. Rennet is the enzyme obtained from a calf’s stomach which is used in the cheesemaking process to coagulate milk and is the magic ingredient in Junket puddings. Although a dish savoured only for the well to do in medieval times, Junket had become a relatively cheap and accessible family staple by the 1920s.