Cook these ingredients slowly and let the sauce become syrupy and sticky. Make it up the day before or earlier and keep in the fridge. The clouds will go away and a sunny day will come so that you can then concentrate on lighting the barbecue coals and pouring that chilled beer.
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Melt the butter in a saucepan add the onion and fry until soft (sweat).
Add all the other ingredients and stir well.
Bring the sauce to the boil and then reduce to simmer for at least 10 minutes or until the sauce reduces and becomes syrupy.
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