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Caramelized Onion Jam

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Sweet, savory, and richly flavored caramelized onion jam—ideal for spreading on toast, serving with cheese, or using as a condiment for sandwiches and meats.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced (about 800 g)
  • 2 Tbsp olive oil
  • 2 Tbsp unsalted butter
  • 2 Tbsp brown sugar
  • 3 Tbsp balsamic vinegar
  • 1 tsp fresh thyme leaves (or ½ tsp dried thyme)
  • ½ tsp kosher salt (adjust to taste)
  • ¼ tsp freshly ground black pepper
  • Optional: pinch of red pepper flakes or splash of port/wine for depth

Instructions

  1. In a large skillet over medium heat, heat olive oil and butter until melted.
  2. Add the sliced onions, stir to coat, and cook for 5 minutes until softened.
  3. Reduce heat to medium-low and continue cooking, stirring occasionally, for 25–30 minutes until onions are deep golden—adjust heat to prevent burning.
  4. Stir in brown sugar and thyme; cook 2 minutes to caramelize sugar.
  5. Add balsamic vinegar (and optional splash of wine/port), then stir and simmer 3–5 minutes until liquid reduces to jammy consistency.
  6. Season with salt, pepper, and red pepper flakes if using. Taste and adjust seasoning.
  7. Remove from heat and let cool to room temperature.
  8. Transfer to a clean jar; store in the refrigerator for up to 2 weeks.

Notes

  • For deeper flavor, substitute half of the balsamic vinegar with red wine or port.
  • Use yellow onions for balance; sweet onions yield a milder jam, while red onions add color.
  • Make extra and freeze in ice cube trays for easy portions.
  • Stir into risotto, top burgers or grilled cheese, or serve alongside sharp cheeses.
  • Let it cool fully before sealing the jar to preserve freshness.

Nutrition

Find it online: https://ukfinda.com/caramelized-onion-jam/