Caramelized Onion Jam

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Rich, savory, and kissed with sweetness, Caramelized Onion Jam is a flavor-packed condiment you didn’t know you needed. This small-batch recipe turns humble onions into a glossy, golden-brown jam that can elevate everything from grilled cheese to charcuterie boards.

Slow-cooked to draw out their natural sugars, the onions develop a deep, mellow complexity. Hints of balsamic vinegar and brown sugar round out the flavor, making it the perfect balance of sweet, tangy, and umami. It stores beautifully and gets even better after a day in the fridge.

What Onions Work Best for Caramelized Onion Jam?

Yellow onions are your go-to here. They offer just the right balance of sweet and sharp, and they caramelize beautifully. Sweet onions like Vidalia work too if you want a gentler flavor, while red onions add a bolder hue and bite.

Ingredients for the Caramelized Onion Jam

• 2 tablespoons olive oil
• 2 tablespoons unsalted butter
• 4 large yellow onions, thinly sliced
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 2 tablespoons brown sugar
• 1/4 cup balsamic vinegar
• 1 tablespoon apple cider vinegar
• Optional: 1 teaspoon fresh thyme leaves

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How To Make the Caramelized Onion Jam

Step 1: Start with a Low and Slow Saute

Heat olive oil and butter in a large skillet over medium-low heat. Add sliced onions, salt, and pepper. Stir to coat, then reduce heat to low. Let the onions slowly cook for 35–45 minutes, stirring occasionally, until they are soft, golden brown, and deeply caramelized.

Step 2: Sweeten and Deglaze

Sprinkle in brown sugar and continue cooking for 5 more minutes. Increase heat slightly and pour in the balsamic vinegar and apple cider vinegar, scraping up any brown bits from the pan.

Step 3: Let It Simmer

Cook for another 5–10 minutes until the liquids reduce and the mixture becomes jammy. If using, stir in fresh thyme at the end.

Step 4: Cool and Store

Remove from heat and let cool slightly. Transfer to a clean jar. Store in the fridge for up to 2 weeks.

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Serving and Storing Caramelized Onion Jam

This jam is endlessly versatile. Use it as a topping for burgers, crostini, grilled cheese, or flatbreads. Stir it into mashed potatoes or serve alongside a cheese board. It’s also an amazing base layer in savory tarts or galettes.

To store, keep it in an airtight container in the refrigerator. The flavor actually deepens over a day or two, making it ideal for prep ahead. It also freezes well for up to 3 months.

Frequently Asked Questions

Can I use red onions instead?

Yes! Red onions create a slightly more tangy and colorful jam. They caramelize a bit differently but still taste amazing.

How long does onion jam last in the fridge?

Stored properly, it lasts up to 2 weeks refrigerated. Make sure it’s in a sealed jar or container.

Can I can this onion jam?

Because it’s low-acid and contains fat, this recipe isn’t suitable for traditional canning. Stick with refrigeration or freezing.

What proteins pair best with it?

It’s excellent with beef, pork, or chicken. It also pairs beautifully with creamy cheeses like brie or goat cheese.

Can I make it without vinegar?

Vinegar is essential for balance and preservation. You can adjust the types, but don’t skip it entirely.

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Want More Condiment Ideas?

If you love this onion jam, check out some of my other creative and flavor-boosting favorites:

• Candied Jalapeños – The Perfect Sweet and Spicy Treat
• Giant Zucchini Parmesan
• Creamy Garlic Chicken Breasts
• Authentic 7 Layer Mexican Dip
• Broccoli Salad

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Let me know how you served your caramelized onion jam! Did you go classic with cheese, or try something adventurous? Share your tweaks, questions, or your own favorite pairings in the comments—I’d love to hear how you’re enjoying it.

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