Put the orange juice and the sugar into a small pot and simmer for several minutes till the sugar is melted and the syrup has reduced by a third.
Heat the fry pan and add the pistachios and toss for 2 minutes until the nuts are toasted and lightly coloured. Cool
Put the zest, ricotta, sugar and cream into a food processor and mix till combined. Put into a bowl and mix in the chopped chocolate.
Put a heaped spoon of ricotta into each pancake and seal by pressing the edges together well. Heat the oil in a frypan . ( this can be as shallow as you like). Fry on each side till crispy. Drain on paper.