French Onion Soup with Gruyére Toasts

French onion soup is probably the best known and loved of all French soups.

It was a favourite for breakfast in the cafés beside the old markets at Les Halles in Paris and is still a favourite on bistro menus at Rungis market. In France this soup is served in special white porcelain tureens. Serve with a glass of gutsy French vin de table.

Serves 6