Rennet Custard or Slip
Put into a glass pudding-dish a pint of milk, a tablespoon of sugar, and a teaspoon of rennet. Stir to dissolve the sugar, cover it and place it on the stove-hearth, or any warm place, to heat sufficiently for the rennet to act upon the casein of the milk—that is, to about 98° Fahr. As soon as it is “set,” or becomes solid, remove to a cool place, so that the separation of the casein shall not go too far and whey appear. When it is cool, serve it in glass dishes. Rennet custard may be flavored with nutmeg grated over the surface, or by stirring in with the rennet a teaspoon of vanilla, or of rose-water, or a tablespoon of wine. When brandy is added, it is called junket.
Liquid rennet is an extract of the inner lining of the stomach of the calf. It has the power of freeing the albuminous part of milk from its solution,—in other words, of coagulating it. Rennet custard is not of course strictly a custard; it is also called slip, and in Cape Cod it bears the graphic name of “Gap-and-swallow.”