Quick Onion Marmalade - cooking recipe

Ingredients

40 g butter
750 g onions, thinly sliced
200 g soft brown sugar
150 ml red wine vinegar
15 ml mustard seeds

Preparation

Heat butter in a large heavy-based pan and cook onion for 10 minutes, or until softened and lightly browned.
Stir in remaining ingredients and cook, uncoverd, for a further 25 - 30 minutes, stirring occasionally, or until onions are lightly caramelized and very soft.
Season to taste.
Ladle into clean and hot jars and seal immediately.