This recipe wonderful because it can be made ahead of time for easy entertaining. These olives will keep quite well for at least two weeks in the refrigerator and possibly longer and the flavour will intensify. For optimal flavour remember to bring the olives to room temperature or warm gently in a pan before serving. It is normal for the olive oil to solidify in the fridge. When at room temperature the olive oil will return to liquid with no change to the flavour or texture.