Preheat the oven to 150ºC/300ºF/gas 2. Grease and line a rectangular cake tin (roughly 20cm x 30cm).
Place the butter, sugar, honey and salt in a medium pan over a low heat, then allow the butter to melt, stirring occasionally. Meanwhile, roughly chop the nuts and any larger dried fruit, then stir them into the pan along with the oats.
Transfer the mixture to the prepared tin, smoothing it out into an even layer. Place in the hot oven for 35 to 40 minutes, or until golden around the edges. Leave to cool completely, then cut into squares and serve.
Flapjacks can go hard if the temperature is too high when heating the butter, sugar and syrup mixture on the hob. Instead, keep it on a low heat, stirring occasionally. During baking, rotating the tray in the oven can help them cook more evenly. The oven temperature can also affect the texture, so bake your flapjacks until golden and slightly soft in the middle (bear in mind that they will harden slightly after cooling, too).
What holds flapjacks together?
Butter and syrup are the binding agents that help hold flapjacks together, meaning you end up with deliciously chewy, buttery slices.