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Preserves

Onion and Chilli Marmalade

This onion and chilli marmalade is a rich, sweet, and gently spiced preserve that turns a simple set of ingredients into something truly special. With a mix of red and brown onions cooked slowly until soft and caramelised, this recipe creates a deep, mellow base that carries layers of flavour. Soft brown sugar adds warmth and richness, while a splash of port brings a round fruity note that sets this marmalade apart from more traditional versions. The cider and balsamic vinegars balance the sweetness with a bright, tangy lift, and the combination of mixed herbs and crushed chilli flakes gives the finished marmalade a subtle aromatic edge along with a pleasant touch of heat.

Prep
10 mins
Cook
135 mins
Total
145 mins
Makes
4

Ingredients

  • 2 kg red and brown onions
  • 6 tbsp olive oil
  • 300 g soft brown sugar
  • 200 ml port
  • 4 tbsp cider vinegar
  • 4 tbsp balsamic vinegar
  • 2 tsp mixed herbs
  • 2 tsp crushed chilli flakes

Method

  1. Peel and slice the onions
  2. heat the oil in a large pan, add the sliced onions and cook down for 25-30 mins on a low to medium heat, stirring occasionally
  3. add 100g of the sugar and cook for a futher 15 mins
  4. add the remaining ingredients and allow to continue cooking for another hour and a half
  5. When the marmalade is about 15 minutes from finishing cooking, pre heat the oven to 160C, wash your jars in hot soapy water and place in the oven on a tray for at least 10 mins to sterilise
  6. while the jars are still hot, spoon the onion mixture in and seal the lids on immediately
  7. allow to cool and store in a cool dry place, once opened store in the refrigerator