Granola bars with a fruit filled centre

For the fruit filling:

150g raspberry jam

40g muscovado sugar

100ml orange juice

1 tsp mixed spice

75g dried cherries, roughly chopped

50g mixed peel, roughly chopped

100g sultanas

For the granola bar:

375g butter

100g golden syrup

240g muscovado sugar

450g porridge oats

220g plain flour

75g hazelnuts, chopped

25g dried cherries, roughly chopped