Ricotta Tart with a Chocolate Crust

This is a typical southern combination of flavours: ricotta, the burstingly ripe oranges and, every Italian’s obsession, chocolate. It is quite simple to make, so don’t be intimidated by the thought of the pastry crust. If it seems too soft, just add more flour as you’re rolling it, then lift it over your rolling pin and gently lower it into the tin. If it breaks, just patchwork it in.