Step by step
Add a glass of water, bring to a simmer and add salt to taste. Add two bay leafs and continue to simmer for 1-2 hours, adding water if necessary
Tips
Do you want to try an unusual version - and one with a rather richer taste - of these sweet-and-sour onions? Use butter instead of oil whilst frying.
Trivia
‘Borettane’ onions originate in Emilia-Romagna, specifically in the town of Boretto, near Reggio Emilia.