6 large white onions, thinly sliced
sprig rosemary
Dijon mustard
3 bay leaves
2 litres/3Β½ pints pint good rich beef stock
salt and freshly ground black pepper
1Β½ tbsp caster sugar
1 tbsp olive oil
50²µ/1ΒΎ΄Η³ϊ butter
25g/1oz ²µ°ω³ά²βΓ¨°ω±π cheese, grated
Β½ thin baguette
200ml/7fl oz white wine