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Step 1: Slice the onions and fry long and slow in a frying pan with a little butter, adding sugar to help the caramelization.
Step 2: When it has cooked down and caramelized a lovely rich golden brown, add the Vino Cotto. This will store well in the fridge.
Use Caramelised Onion to make
2 brown onions finely sliced
[unknown amount] 2 tbspn brown sugar
[unknown amount] 3 tbspn Vino Cotto