Onion Jam

Onion Jam (or relish or marmalade or whatever you would like to call it) is a staple in our house. We get a bit panicky when we look in the cupboard to find there’s a only a couple of jars left. It’s slathered on everything from toasties and pizzas to dainty canapes and cheese platters. Onion jam is decidedly ugly but if you can get someone to try it, they never look back. Jars of this sticky brown goodness are given to close friends only. The reason being that the recipe requires slicing an absolute shitload of onions. And I could never do that for someone I only liked a little bit.


The following is a basic guide to making six jars for your nearest and dearest this Christmas. You can tweak it to your own taste and add extra things like ginger or other spices. Up to you. One hot tip: if you don’t have a wide-mouthed funnel suitable for filling jam jars, then get one. Without it, spooning warm onion jam into glass jars and not making a huge mess, is impossible. You’ve been warned. Maybe ask Santa for one.

Ingredients  (makes 6x 500g jars)

4 kg brown onions (peeled, halved and sliced)
1 1/2 cups balsamic vinegar
2 cups apple cider vinegar
1 cup red wine vinegar
4 tablespoons olive oil
4 cups brown sugar
Small bunch fresh thyme (or one tablespoon dried thyme)
4 cloves
10 ground pepper corns
1 teaspoon salt
Wine – red or white – to drink while you stir and also to top up liquid levels if they get a bit low

To make

There’s no getting around this: you have to peel, halve and slice 4 kilos of brown onions. Just do it and get it over with. Listen to some music. It won’t take as long as you think. Keep the slices on the thickish side. Say around 1cm. No need to get too fussy, you just want some of them to retain a little shape when they’re cooked.


Heat the olive oil on a medium-high heat in a thick bottomed stock pot. Add enough onions to fill a quarter of the pot. Fry the onions for about fifteen minutes or until softened and then add the rest of the ingredients. Stir for another ten minutes and then as the mixture collapses and makes more room in the pot, you can start to add the rest of the onions slices. Stir constantly until all the onions have softened. There should be plenty of liquid at this point. Turn the heat down and simmer for the next 2 hours. Stir every now and then and check that there’s enough liquid. This is where you can add some wine if it looks like it’s getting dry.

After 2 hours the onions should be dark, sticky and jammy.


Divide into your six sterilised jars (hopefully you’ve been collecting jars for this very reason all year). Tie some tags on them with cute string. And then decide who has been good enough to get one. Merry Christmas.



2 thoughts on “Onion Jam

    1. Ha! Definitely enlist helpers with the onion chopping. My husband and I get a little production line happening. Best of luck. I promise it’s worth it 🙂


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