Baklava with spiced nuts, ricotta & chocolate

step 1 First, make the syrup. Tip the sugar into a large saucepan with 650ml water. Stir over a low heat until the sugar has dissolved, then turn up the heat and bring to the boil. Reduce the heat to a simmer and cook for 15 mins, then squeeze in a few drops of lemon juice and simmer for a further 5 mins. Remove from the heat and leave to cool. Meanwhile, for assembling the baklava later, melt the butter in a small pan over a low heat for 5 mins, skimming and discarding any froth that rises to the surface. step 2 For the filling, crush all of the nuts in a pestle and mortar, or blitz in a