Nigella Lawson makes roasted red onions with basil on Nigellissima.

Nigella says: “I can’t claim that this recipe is exactly Italian, but I came across red onions for the first time when I was in Italy so it inspired me. The flavour I add is very Italian though – fennel seeds. I use the basil more like a salad leaf here, rather than a garnish.”

The ingredients are: red onions, olive oil, fennel seeds, salt, balsamic vinegar, fresh basil.

See how Nigella prepares her dish in this video: