The perfect accompaniment to most cheese esp a good blue, I never serve a cheese board without it.
It takes hours and hours to cook out, so I strongly suggest you make it in bulk as it will keep in a jar in the fridge for two months once left unopened.
You will get 10 jam jars full from this recipe, halve the recipe if that is too much for you. The ingredients are cheap so why not make the full batch and give to friends and family or give as a special gift along with a nice selection of cheese and terrines.
VEGETARIANS… slice and fry some mushrooms in garlic and a little chilli, then serve on toast with a dollop of these onions for a nice snack, nom nom nom