Onion Jam

I’m always on the lookout for a good savory jam. This onion jam is at the top of my list of favorites.

slice of bread with onion jam with text overlay for facebook


 

While onions in a jam may sound odd, trust me — it’s delicious. Once caramelized, the flavor of the onions becomes sweet. Then the thyme and vinegars help to create a savory balance.

What to do with Onion Jam

I love to use this as a burger topping, or even put it on my steak. You can also braise chicken in it, use it as an alternative pizza sauce, or spread it on any sandwich.

One of my other favorite ways to use it is on a cheese board — goat cheese, blue cheese, and cheddar are all made better with a dollop. Oh, and don’t sleep on spreading it on a warm puff pastry wrapped round of brie!

A charcuterie board benefits from it, too. Throw some onion jam on baguette slices and top them with salty meats like salami, prosciutto, and sopressata.

You can also use it in other dishes like tossing steamed vegetables with it, or as part of a delicious French onion soup. 

This simple recipe is super versatile. Next time you find yourself with a few onions in the fridge, try whipping up this savory jam.

straight on shot of jar of onion jam

Why You’ll Love Onion Jam

Easy- I love easy recipes and this definitely qualifies. While it does take a bit of time to cook, the prep is quick and the process just involves stirring.

Delicious- The natural sweetness of the onions is brought out by caramelizing them. But there’s also a balance of flavors with the acid from the vinegar.

Uncomplicated- With only six ingredients, this is one of the most simple recipes but it delivers a ton of flavor.

overhead shot of onion jam spread on bread slices

Ingredients

  • Olive oil– Use extra virgin olive oil for the best results.
  • Large sweet onions– I happen to think that Vidalias are the best onions for this recipe, but you can use any large onions that you have handy. Chop them however you choose but diced onions are ideal for a jam being used as a condiment.
  • Coarse Kosher salt– Kosher salt takes a bit more time than other salt to dissolve. However, since this jam takes a while to come together, I prefer to use Kosher for its quality.
  • Sugar– Either cane sugar or white granulated sugar will work — they are interchangeable in this recipe.
  • Red wine vinegar– This helps to add some balance, introducing some acid to the dish.
  • White balsamic vinegar– White balsamic tends to be higher quality and really elevates the flavors.
  • Fresh thyme leaves– Fresh is really best. However, if you don’t have it, remember the simple conversion of 1 tsp dried to 1 tbsp fresh herbs.
close up of onion jam spread on bread slice

How To Make Onion Jam

  1. Heat olive oil. Heat the olive oil over medium-low to medium heat in a large skillet or saucepan. Olive oil has a high smoke point, but you want to remain vigilant to ensure it doesn’t burn. 
  2. Add onions and salt. Once the oil is warm, add the onions and salt. When adding the onions, do so gently to avoid any splattering.
  3. Stir until caramel color is reached. Continue to cook the onions slowly, until they start to caramelize and turn an amber color. Stir frequently to ensure the onions do not stick to the pan or burn.
  4. Add remaining ingredients. Once the onions reach that amber color, add the sugar, vinegar, and thyme leaves. 
  5. Stir until dissolved. Stir all of the ingredients together until the sugar completely dissolves. Granulated sugar dissolves fairly quickly, but be sure that it breaks down entirely to avoid any graininess in your jam.
  6. Let thicken. Keep the mixture over low heat, continuing to stir occasionally until the mixture reduces and thickens. Make sure to occasionally scrape the bottom of the pan to incorporate all of the flavors.
  7. Cool. Remove from heat and serve or allow to come to room temperature before refrigerating.
collage of how to make onion jam

Variations

  • Brown sugar- Instead of white sugar you can use brown for a more molasses-infused flavor. You can also reduce the sugar for a more savory jam.
  • Lemon juice– Adding just a little lemon juice at the end of cooking will help to brighten the flavors.
  • Mustard seeds– You can use mustard seeds to impart a somewhat nutty flavor.
  • Bay leaves– Adding a bay leaf or two at the beginning of the cooking process for a little extra brightness as well. Just make sure to take it out when the jam is finished.
  • Black pepper– You can spice up your onion jam by adding a bit of black pepper to taste.
  • Other types of onions– Experiment with other onions. Any variety of white onions are an option and red onions will work as well. 
  • Vinegar– Instead, try using apple cider vinegar, white vinegar, or regular balsamic.
straight on shot of bite taken out of slice of bread with onion jam on it

Storage & Canning

Store in an airtight container for up to a week. If you want to store it for several months, you can use an ice cube tray to store and freeze the jam. You can also keep it for a long time by canning it.

Onion jam is best served without a chill, so take it out of the fridge a few minutes before you are ready to serve it and stir well.

collage of onion jam for pinterest

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angled shot of bowl of bacon jam with spoon in it on board with crackers

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wooden spoon in jar of onion jam for pinterest
spoon scooping onion jam out of jar

Onion Jam Recipe

4.67 from 12 votes
This savory and sweet onion jam tastes good on everything from brie to burgers. Make a double or triple batch and deliver it as gifts, can or freeze.
Prep Time: 5 minutes
Cook Time: 45 minutes
Total Time: 50 minutes
Servings: 14

Ingredients

Instructions

  • Heat the olive oil over medium-low heat in a large saucepan. Add the onions and salt and continue to cook, slowly, until they start to caramelize and turn an amber color, approximately 20 minutes.
  • Add the sugar, vinegar and thyme leaves, stirring to combine until sugars dissolve. Keep heat low, stirring occasionally for about 15 minutes until the mixture reduces and thickens.
  • Remove from heat and serve or allow to cool fully before refrigerating.
  • If you've tried this recipe, come back and let us know how it was in the comments or star ratings!

Nutrition

Calories: 98 kcal, Carbohydrates: 20 g, Protein: 0.5 g, Fat: 2 g, Saturated Fat: 0.3 g, Polyunsaturated Fat: 0.2 g, Monounsaturated Fat: 1 g, Sodium: 173 mg, Potassium: 75 mg, Fiber: 1 g, Sugar: 18 g, Vitamin A: 24 IU, Vitamin C: 3 mg, Calcium: 15 mg, Iron: 0.3 mg
Author: Jessica Formicola
Calories: 98
Course: Condiment
Cuisine: American
Keyword: onion jam, balsamic onion jam, onion jam recipe
Did you make this recipe?I’d love to see your recipes – snap a picture and mention @savoryexperiments or tag #savoryexperiments!

Jessica Formicola in her ktichen

About the Author

Jessica Formicola

Jessica the mom, wife and food lover behind Savory Experiments. She is obsessed with butter, salt and bacon and spends all her time in the kitchen and behind a camera. Jessica is a contributor to PopKitchen by Parade, Better Homes & Gardens, The Daily Meal Food + Travel and more!

Read More About Jessica

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Recipe Rating




Questions and Reviews

  1. 5 stars
    Addictive! I saw this recipe and thought it would make nice homemade Christmas gifts for my two sons-in-law. I made one batch to try it out and ended up eating the whole jar in about 2 weeks. It’s delicious on toast, as a condiment on a turkey sandwich, I’ve even put it on pizza! Super delicious!

  2. 5 stars
    Definitely going to include this on my next charcuterie board! Such a unique and delicious recipe; definitely too good to pass up!

  3. 5 stars
    What a terrific recipe! Spread on a crunchy crostini, this tastes like French Onion Soup in a jar. Perfect for an easy appetizer or as a topping for our favorite bacon cheeseburgers. Another keeper from Savory Experiments!

  4. 5 stars
    Love this onion jam! It’s so versatile, we use it almost every day: on pizza, in sandwiches, savoury tarts, mixing with cream cheese and stuffing chicken breaststroke! We love it! Thanks for the recipe:)

  5. 5 stars
    This was so flavorful on burgers and made it truly delicious! I’ll be trying it on hot dogs next! So good!

  6. 5 stars
    This onion jam is amazing!!! I put this on almost everything and is a great addition to my cheese board for parties! Crowd pleaser, for sure!