Onion Marmelade

Preparation Time 10 minutes
Cooking Time 40 minutes
Standing/Marinating Cooling
Serves 2 x 500ml jars
40ml butter 150ml red wine vinegar
750g onion, thinly sliced 15ml black mustard seed
200g soft brown sugar


  1. Heat the butter in a large, heavy-based pan and cook the onions for about 10 minutes, until softened and slightly brown.
  2. Stir in the remaining ingredients and cook, uncovered, for a further 25-30 minutes, stirring occasionally. The onions should turn soft, light brown and caramelize slightly.
  3. Ladle into hot sterilised jars and seal immediately.
  4. Once cooled, refrigerate for up to 1 week.