A new favorite. Easy to make and just wonderful to eat.
When filling the jars with onions, press them down. You should have at least half of each quart filled with firmly packed onions.
When serving we like to top this with shredded Gruyère cheese
In making the broth, it needs to be very dense and flavorful. We usually make a dark bone broth with several beef femurs, then adding a bit of wine, bay leaves, salt and peppercorns. Let it simmer for several hours.