Roast fennel with olive and orange stuffing

These are delicious on their own as a main course, but equally they make a great starter (serve just one per person) or a side dish with a meat or fish main course. I like to replace the orange zest with lemon or lime for serving with grilled fish, or add lots of mint to the mixture and serve with grilled lamb chops. The roast fennel are also good to eat at room temperature, so they make a great picnic dish.