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- 45 ml olive oil
- 15 g unsalted butter
- 2 onions
- Heat the oil and butter in a pan, add the onions, sugar and thyme; cook over a low heat for 10-12 minutes until golden, soft and caramelised.
- Add the vinegar, cook for a further 10 minutes until the onions take on a sweet and sour flavour, remove, season to taste and allow to go cold.