
Source: seed-scottish
Line a 20cm square tin with greaseproof paper. Place sugar, condensed milk and butter in a heavy-bottomed saucepan and heat gently, stirring constantly until the sugar dissolves completely. Bring to the boil and continue cooking, stirring frequently, until the mixture reaches soft ball stage at 116-118°C on a sugar thermometer, approximately 15-20 minutes. Remove from heat and stir in the vanilla extract. Allow to cool for 5 minutes, then beat vigorously with a wooden spoon until the mixture thickens and becomes grainy, which will take 3-5 minutes. Quickly pour into the prepared tin and mark into squares with a knife whilst still warm. Once completely cold and set, cut into pieces and store in an airtight container.
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