- 1 tbsp olive oil
- 1 onion, finely sliced
- 1 garlic clove, finely sliced
- 200ml/8fl oz chicken stock
- 1 tsp soy sauce
- ½ tsp Worcestershire sauce
- 1 tsp caster sugar
- 1 small slice chargrilled ciabatta
- 25g/1oz Gruyère cheese, sliced
- Preheat the grill to to its highest setting.
- Heat the oil in a saucepan, add the onion and garlic and cook for five minutes, on a low heat, then turn up the heat for 2-3 minutes, to brown the edges of the onion.
- Add the stock, soy sauce, Worcestershire sauce and caster sugar, allow to simmer, until thickened.
- Meanwhile, top the ciabatta slice with the cheese and place under the grill to cook for 1-2 minutes, until bubbling and golden.
- To serve, spoon the soup into a bowl and top with the crouton.