Run your knife down the vanilla pod scrape out the seeds and add with the pod to the strawberries and the sugar. Mush it up a bit with a whisk leaving some large chunks. Put on a medium heat to bring to a gentle simmer and leave to cook for about 4 minutes. Using a ladle remove the scum from the top and leave to cool. Place in sterilized jars and store in the refrigerator.
Recipe (c) Jamie Oliver 2002