Put a pint of rich milk in a double boiler, sweeten with two
tablespoonfuls of granulated sugar. While the milk is coming to the
boiling point beat the yolks of four eggs until light and creamy, add
the hot milk to the eggs, stirring briskly, then turn it into the
boiler, stirring rapidly until it thickens, remove from the fire, turn
into a bowl, flavor with vanilla extract and serve very cold.