Always sterilise your jars thoroughly before filling - we recommend using Kilner’s recommended water bath method. It's also a good idea to refer to the correct way to fill your chosen jar. This will differ depending on whether you are using jars with twist on lids or clip sided jars. Refer to Pam Corbin's advice about sealing and filling your jars in her recipes here. But for the best results use good ol’ dirty brown malt vinegar. You’ll need roughly an equal volume of water to weight of onions – ie 100ml vinegar for every 100g of onions. And you also need 40g white sugar per 100g onions.

One way to do this is to put jars and lids in a hot dishwasher cycle. Alternatively wash them really well in hot soapy water, place them on a baking tray and put them in a low oven at about (110ºC) for at least 20 minutes. Whichever method you use make sure they’re still warm and completely dry before filling.These tips are taken from the experts! If you would like to read what they say for yourself we recommend: Gently heat the vinegar and spices for five to ten minutes (don’t let it boil), stirring to dissolve the sugar, then set aside to cool. It dries out moisture and inhibits the growth of the microorganisms as well as protecting the flavour. There are two ways to apply salt either to dry salt - i.e. layer the vegetables in a colander and sprinkle with salt as you go along and leave to dry out for up 24 hours. Or to wet-salt or make a brine (50g salt to 600l water) You need a salt that dissolves well in water which is why we love Maldon Sea Salt. Otherwise keep interesting bottles and jars of different sizes, using their manufacturers’ matching lids with regulation rubber inner seals, most modern jars have these - just make sure they are vinegar-proof.

You could reach straight for the knife to whip off the brown skins but, for a more precise and easy peel, first soak them for five minutes in a bowl of boiling water and rinse until cool enough to handle. Trim the bare minimum from the tops and bottoms (excess trimming could cause more layers to slip off) and the skins should peel away with ease.