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Put the milk into a heavy based pan and slowly bring to boil. Add the sugar and butter and heat slowly, stirring gently all the time until the sugar has dissolved and the butter is melted. Bring to boil and place a lid on the pan.
Boil for 2 minutes, then uncover and boil steadily for 10-15 minutes until a little of the mixture can be rolled into a soft ball when dropped into cold water (or 115 degrees C/238 degrees F on a sugar thermometer). Remove from the heat and stir in the vanilla.
Allow to stand for 5 minutes, then beat well until thick and creamy.
Pour into a buttered tin and cut into squares when cold. |