How to Caramelise Red Onions

Make a step up from your regular fried hot dog onions to these sweet tasting, caramelised red onions that go wonderful with steak and sausages in crusty rolls.

So, how do you caramelise onions? All you really need to do is heat up a little olive oil in the frying pan, add a tablespoon of balsamic vinegar and brown sugar – stirring for 20 minutes – until the onions have lightly browned.

These instructions are not restricted to how to caramelise ‘red onion’ but if you desire it works exactly the same if you were to caramelise yellow onions. But caramelised red onions look so much more appetising with a vibrant colour.

Prep Time: 10 Minutes
Cooking Time: 20 Minutes
Serves: 2

Nutritional Information:

Calories: 638 Fat: 31.8g Salt: 0.8g Carbs: 72.8g Protein: 9.8g Fibre: 11.2g Energy: 2641kJ


  • 2 Medium size red onions
  • 1 tbsp. Cooking olive oil
  • 1 tbsp. Brown sugar
  • 1 tbsp. Balsamic vinegar


  • Begin be slicing 2 red onions about 5mm thick and pull out the inner rings to make more, smaller rings
  • Add 1 tablespoon of olive oil to a heavy grill pan and bring to a medium heat
  • Pour in all the onion and cook them for about 5 minutes, tossing and turning the onions continuously
  • Then add 1 tablespoon of brown sugar, mixing into the onions thoroughly
  • And then add 1 tablespoon of balsamic vinegar, again mixing in thoroughly with the onions and sugar
  • Bring the heat down to a low setting, tossing and turning the onions for 20 minutes being care not to burn or darken the onion
  • When the onions have soften with a sticky look, they should just about be done

Serving Suggestions:

Serve these caramelised red onions in a ciabatta roll with a medium cooked steak or sausages. You could also try a posh hot dog and replace your yellow onions with these caramelised onions.

Leave a Reply

Your email address will not be published. Required fields are marked *