In the fridge cover with a lid or cling film. Note that the olive oil will solidify in the fridge, and this is perfectly normal. u003cstrongu003eTake the vinaigrette out of the fridge for at least 20 minutes and make sure to shake it well just before serving to reactivate the emulsion. u003c/strongu003eTo speed up the process you can also place the vinaigrette jar in a ball of warm water to help liquify the olive oil.