Makes approximately 25 pieces 125g salted butter 500g caster sugar 100ml milk 400g condensed milk
In a large saucepan, combine the sugar and milk into a paste, then chop the butter roughly and mix in. Pour in the condensed milk and place on a low heat until the butter melts, stirring occasionally. Bring to a simmer for 2 mins, until the sugar has dissolved, then bring to a boil. Continue for 10-15 mins on a rolling boil, stirring continuously so the bottom of the pan does not burn. The temperature should rise to more than 115°C and the mixture should set firm when a teaspoon amount is removed and placed on a cold plate. Line a 15cm square tray with butter and cling film, and pour in the mixture. Leave at room temperature, until cool and firm, then cut into cubes and serve.