Caramelized onion jam is the perfect blend of sweet and savory, with a rich, deep flavor that complements so many dishes. Whether used as a topping for burgers, sandwiches, cheese boards, or even served alongside roasted meats, this jam brings out the best in any meal. It’s a versatile and delicious homemade preserve you’ll want to keep on hand!
Ingredients:
- 4 large onions (yellow or red), thinly sliced
- 2 tablespoons olive oil
- 1/4 cup balsamic vinegar
- 1/4 cup brown sugar
- 1/4 cup water
- 1 tablespoon fresh thyme leaves (or 1 teaspoon dried thyme)
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1 tablespoon Dijon mustard (optional, for added depth)
Instructions:
1. Caramelize the Onions
- Heat the olive oil in a large, heavy-bottomed skillet over medium heat.
- Add the thinly sliced onions and cook, stirring occasionally, for about 30-40 minutes. The onions should soften and gradually turn a deep golden brown. Be patient, as the slow cooking process is key to developing the jam’s rich flavor.
2. Add Sweeteners and Liquids
- Once the onions are fully caramelized, stir in the balsamic vinegar, brown sugar, water, thyme, salt, and pepper.
- Cook the mixture over low heat, stirring occasionally, for an additional 15-20 minutes, allowing the flavors to meld and the liquid to reduce into a syrupy consistency.
3. Adjust the Flavor
- Taste the jam and adjust the seasoning, adding more salt, pepper, or sugar if desired. You can also stir in Dijon mustard at this point for a tangy twist.
4. Blend (Optional)
- If you prefer a smoother texture, you can use an immersion blender to pulse the mixture a few times. Alternatively, you can transfer it to a blender or food processor and blend until smooth.
5. Fill and Seal the Jars
- Sterilize your jars and lids by boiling them in water for 10 minutes.
- Carefully ladle the hot caramelized onion jam into the warm sterilized jars, leaving about 1/4 inch of headspace.
- Wipe the rims clean, place the lids on, and screw the rings on snugly.
6. Optional Water Bath Canning
- For long-term storage, process the jars in a boiling water bath for 10 minutes.
- Remove the jars and let them cool on a towel or rack, ensuring they are sealed properly.
Storage:
- Properly sealed jars can be stored in a cool, dark place for up to 1 year.
- Once opened, refrigerate and consume within 2-3 weeks.
Serving Suggestions:
- Spread on burgers, sandwiches, or grilled cheese for a burst of flavor.
- Serve as an accompaniment to roasted meats or grilled vegetables.
- Add to a cheese platter with your favorite cheeses and crackers.
- Use as a topping for pizza, flatbreads, or crostini.
Tips for Success:
- Use a heavy-bottomed pan to prevent the onions from burning during the slow caramelization process.
- For extra complexity, try adding a splash of red wine or apple cider vinegar instead of balsamic vinegar.
- This jam can also be made spicier by adding a pinch of chili flakes or a dash of hot sauce during cooking.
This caramelized onion jam is a true gourmet delight—its rich, complex flavor will elevate any dish and make your meals even more enjoyable!
