6 large white onions, thinly sliced
sprig rosemary
Dijon mustard
3 bay leaves
2 litres/3陆 pints pint good rich beef stock
salt and freshly ground black pepper
1陆 tbsp caster sugar
1 tbsp olive oil
50驳/1戮辞锄 butter
25g/1oz 驳谤耻测猫谤别 cheese, grated
陆 thin baguette
200ml/7fl oz white wine