Red Onion Jam - cooking recipe

Ingredients

120 ml sunflower oil (or groundnut oil)
700 g red onions, very finely sliced
175 g caster sugar
150 ml sherry wine vinegar
2 tablespoons grenadine, cordial
250 ml red wine
1 teaspoon salt
1 teaspoon fresh ground black pepper

Preparation

Heat the oil in a wide shallow pan, then add the onions, sugar and salt and pepper: cook very gently for 30 minutes, stirring occasionally until most of the liquid has evaporated.
Add the sherry vinegar, grenadine and red wine: continue to cook, uncovered, at a gentle simmer for a further 30 minutes, stirring regularly until it reaches the consistency of jam.
Allow to cool before decanting and sealing in sterilised jars.