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Bowl of spicy caramelized onion relish garnished with fresh chili.
Sweet and spicy onion relish with balsamic

Sweet & Spicy Caramelized Onion Relish

Author: Flavelo
Sauces and Gravies Recipes
The secret to perfect caramelized onions is time. You can't rush it; the natural sugars need to transform slowly to achieve that deep, umami-rich flavor that makes this relish irresistible. Your patience is rewarded with a jammy, rich condiment, brightened by the acidity of balsamic vinegar and the heat of chili. It's the ultimate burger topping or accompaniment to roasted meats.
🕒 Prep Time 10 mins
🍳 Cook Time 25 mins
⌛ Total Time 35 mins
🍽️ Servings 4 servings
🔥 Calories 120 kcal
🌍 Cuisine Modern American

Ingredients

Equipment Needed

  • Wide skillet (for faster evaporation)
  • Wooden spoon

Allergen Information

⚠️ Milk

Instructions

1 ✓

Peel the onions, cut them in half, and slice thinly.

Tip: The thinner the slice, the faster they caramelize.
2 ✓

Melt the butter in a skillet over medium heat, then add the onions and salt.

Tip: Salt helps draw moisture out of the onions (osmosis), speeding up the browning process.
3 ✓

Cook the onions, stirring frequently, for about 15-20 minutes until golden brown and soft.

Tip: If they start to stick, add a splash of water and scrape up the browned bits (fond).
4 ✓

Sprinkle with brown sugar and chili flakes, then cook for another 2-3 minutes.

Tip: The sugar aids browning and helps achieve a sticky consistency.
5 ✓

Pour in the balsamic vinegar and cook for 1-2 minutes until the sharp smell dissipates and you have a thick, glossy sauce.

Tip: The acidity of the vinegar balances the sweetness of the onions and sugar.

Recipe FAQ

Can I use red onions?
Yes, absolutely! Red onions are sweeter and give the final dish a beautiful dark color.
My onions burned, can I save them?
Unfortunately, if they are blackened and bitter, no. Start over and use lower heat.

Ingredients

  • 3 large Onions (Yellow or Sweet)
  • 2 tbsp Unsalted Butter
  • 2 tbsp Brown Sugar
  • 2 tbsp Balsamic Vinegar
  • 1 pinch Red Pepper Flakes (to taste)
  • 1 pinch Kosher Salt