Write the next sentence in the following story.

How to preserve artichokes in oil
Buy approximately 4.4 lbs.
( 2 kg) of small artichokes that are all about the same size. Choose artichokes that are heavy for their size and have closed leaves, which signify that they are fresh.
Fill a large bowl with cold water, cut 4 or 5 lemons in half, and squeeze most of the lemon halves into the bowl of water. Extract the hearts from the artichokes.