Add all of the ingredients (apart from the brown sugar, sour cream and chives) to a blender and blitz until almost smooth. Transfer to a saucepan over a low-medium heat then stir in the brown sugar
Bring to a simmer, stirring occasionally, then cook uncovered for 30 minutes until thickened and reduced
Taste and adjust the seasoning as needed, then leave to cool before placing into a serving bowl and topping with a spoonful of sour cream and fresh chives. Serve as a dip for chips, or as a condiment for sandwiches or other dishes. It will keep in the fridge, covered, for up to a week
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