"A sweet and sticky caramelised onion and beetroot relish that is perfect for burgers and sandwiches...."
INGREDIENTS
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2 tbsp olive oil
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4 brown onions (800g), sliced thinly
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1 1/2 cups (330g) firmly packed light brown sugar
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1 1/2 cups (375ml) cider vinegar
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3 fresh beetroot (600g), peeled, grated coarsely
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1 tsp coarse cooking salt (kosher salt)
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1/2 tsp cracked black pepper