Makes 12 squares
200g/7oz/scant 1 cup butter, plus extra to grease
175g/6oz/¾ cup Demerara (light brown) sugar
4 tbsp golden (corn) syrup
400g/14oz/4 cups jumbo oats
100g/3½oz/½ cup raisins
4 tbsp chopped walnuts
1 Preheat the oven to 190°C/375°F/Gas 5. Butter a 20cm/8in square baking tin and line with parchment paper.
2 Melt the butter in a large pan and stir in the sugar and syrup. Heat gently until the sugar dissolves.
3 Off the heat, stir in the oats, raisins and nuts. Press the mixture into the prepared tin and bake in the oven for 17–20 minutes until lightly golden.
4 Cool in the tin before cutting into squares.