Ingredients
Method
1.Heat the butter and oil in a large saucepan; add the sliced onions and cook, stirring frequently until they become soft and golden.
2.Add the brown sugar and continue cooking until caramel coloured this will take about 20 minutes. Stir in the balsamic vinegar and brandy and cook for a minute or two.
3.Mix in the flour then, stirring continuously add the stock, and thyme. Simmer for 10 minutes then season with salt and pepper to taste.
4.Divide the soup between 4 bowls. Toast the bread slices and sprinkle top generously cheese, Grill until the cheese is bubbling.
Note
- Slice the onions in a food processor if you have one.