Caramelized Onion Jam | Karen’s Kitchen Stories

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Caramelized Onion Jam

This sweet onion jam is made by taking four large onions and cooking them down for about 90 minutes until you have this caramelized jammy sweetness that even onion haters would love.

You start with about 4 quarts of thinly sliced onions..

Caramelized Onion Jam

 and end up with about three cups of sweet jam.

Caramelized Onion Jam

I have been thinking about how I’m going to use this jam. First, I served it as an appetizer along with some Boursin, toasted sourdough baguette slices, and a sprinkle of thyme along with some grapes.

Caramelized Onion Jam

I loved the combination of the cheese and the onion jam on the toast.

Caramelized Onion Jam

I’m sure this would be incredible on burgers or pulled pork sandwiches. I’m also thinking that it would be great in a grilled cheese sandwich, baked as a swirl into bread, or as a filling for savory pastries. How about mixed with cream cheese, sour cream, and mayo for a caramelized onion dip? How would you use this jam?

Caramelized Onion Jam Recipe

4 very large onions, thinly sliced

3 T olive oil

Sea salt or Kosher salt flakes

3 T balsamic vinegar, plus more if necessary

2 T light brown sugar


  1. Place the onion slices in a very large sauce pan. I used a 6 quart pan. 
  2. Pour the olive oil over the onions and stir them to coat all of the slices with olive oil. 
  3. Sprinkle a large pinch of the salt over the onions.
  4. Cook on medium high heat for about 15 minutes, stirring occasionally. 
  5. Turn the temperature to low and continue to cook the onions for 30 minutes. Stir every few minutes to redistribute the onions and scrape up any onion bits from the bottom of the pan.
  6. Add in the vinegar and brown sugar and stir. Continue to cook on low for another 30 to 45 minutes, stirring regularly to scrape up browned bits, until it reaches the consistency of jam and is sweet and golden brown. If it gets too thick, add a tiny bit more vinegar.
  7. Cool, place in clean glass containers, and refrigerate. The jam should keep for about a week. 
This post is participating in Eating the Alphabet hosted by Brenda of Meal Planning Magic. We’d love to have you participate too. This month’s letters are M, N, and O. This is a time to get creative and try a new ingredient you’re not too familiar with or perhaps share a family favorite that you know is a winner. Savory, sweet or in between–that’s up to you! If you’d like to join in, check out this post about participating. It’s not too late. And check out the other recipes with ingredients that start with M, N, or O in the thumbnails below. 

Letters M, N &/or O
Link up on 8/15/13

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