Ingredients:
400g sugar
160ml liquid glucose
1 tsp lemon essence
80ml water
125g butter
1/2 tsp salt
Method:
Combine the sugar, water and glucose in a heavy saucepan and stir over low heat until all the sugar has dissolved. Increase the heat, bring to a boil then reduce the heat and boil the mixture for about 10 minutes, or until it reaches 150°C (300°F) on a confectioner's thermometer (at this stage the mixture should be a pale golden brown).
Remove from the heat and add the remaining ingredients, stirring until blended. Pour into a lightly greased tin (preferably a Lamington [Swiss roll] tin). Mark the butterscotch into squares whilst still hot then allow to cool completely before breaking into sections.