2. Arrange the onions in a single layer in
an oven dish. Add the bay leaves, as well
as 250ml water. Dot the onions with butter
and season with salt and black pepper
if necessary (remember that they were
cooked in salted water). Bake the onions for
20 minutes and then remove from the oven.
3. Pour the vinegar and sprinkle the sugar
over the onions and combine. Return to
the oven for another 20-30 minutes or until
the onions are golden brown and start to
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