Can't see the video? Download an mp4 [8.54 MB] version of this video. Fill two small cups, or two compartments in an ice cube tray with olive oil and water. Place your experiment in the freezer ...

Using little to no extra oil when making these dishes is one way to avoid a greasy top layer, though Nigella Lawson explained that ice cubes are your best bet if you want to serve food straight away.