French onion soup

• 1 lb (450 g) onions
• 1 oz (25

Peel and finely slice the onions. Melt the butter in a large saucepan over low heat, add the onions and toss them in the butter. Cover with a pan lid and cook gently for about 30–40 minutes so that the onions stew in their own juices and are soft and translucent. Remove the pan lid and cook the onions briskly, stirring occasionally, until lightly browned.

Add the stock and season with s