Line a large baking tray with baking parchment. Put the sugar in a pan and place over a low heat. Shake the pan a little until the sugar starts to clump together. It will slowly start to melt and turn a caramel colour – keep it on the heat until it turns a dark caramel colour.
Once it reaches this colour, stir in the nuts and glacé cherries, then pour onto the lined baking trays. Set aside to cool and set.
Break the brittle into pieces.
Notes
For a festive or party variation, try scattering a few glace cherries over the baking tray before pouring the caramel and nut mixture.