Heat 60 ml (2 fl oz) of the olive oil in a large saucepan, then add the mussels, the white wine and 120 ml (4 fl oz) water. Cook over a high heat until all the mussels are open, discarding any that remain closed. You may need to cook the mussels in batches; divide the oil, wine and water accordingly.
Remove the mussels, and boil to reduce the liquid by half. Remove half the mussels from