When you have a glut of sweet peppers, one of the most delicious things to do with them is to roast them and preserve them in vinegar and oil. Long slow cooking brings out their sweetness, and they make a brilliant addition to mezze and an excellent pizza topping.

Makes 1 jar
8 peppers
White wine vinegar
Extra virgin olive oil

YOU WILL NEED
450ml Kilner jar or equivalent, sterilised

1 Preheat the grill. Put the whole peppers on a baking tray and grill, turning, until blackened all over.
2 Tip the peppers into a large bowl, cover tightly with cling film and leave to cool completely: the cling film traps the steam and helps to separate the skins from the flesh.
3 Once cool, peel away the blackened skins and discard, then open up the peppers to remove the seeds and stems. Tear the flesh into wide strips and drop it into a bowl, along with as much of the juices as you can capture, then tip everything into a sterilised jar.
4 Pour enough vinegar over the peppers to cover, and use a knife to agitate them a little and get rid of any air bubbles, then top with a small slick of olive oil. Seal the jar and transfer to the fridge. Eat within a month.

Turn to page 38 of August's The Simple Things for more of our staple foods feature on peppers from Lia Leendertz.