6 large white onions, thinly sliced
sprig rosemary
Dijon mustard
3 bay leaves
2 litres/3½ pints pint good rich beef stock
salt and freshly ground black pepper
1½ tbsp caster sugar
1 tbsp olive oil
50²µ/1¾´Ç³ú butter
25g/1oz ²µ°ù³Ü²âè°ù±ð cheese, grated
½ thin baguette
200ml/7fl oz white wine