Ingredients
- 15g butter
- 20g plain flour
- 250g white onions, peeled and thinly sliced
- 25ml Roast Onion Infused Balsamic Vinegar
- 750ml beef stock (could also use a vegetable stock)
- 20g demerara sugar
- Sea salt and freshly milled black pepper
- 100g gruyère cheese, grated (mature cheddar would be fine)
Method
- Heat the butter in a suitably sized saucepan over a moderate heat.
- Add the prepared onions and cook gently for approximately 20 minutes, until evenly browned, adding the sugar halfway through this stage.
- Add the Roast Onion Balsamic Vinegar and turn up the heat to reduce and concentrate the flavour.
- Sprinkle on the plain flour and stir well, cooking gently for 5 minutes.
- Gradually add the stock, stirring well to ensure a smooth textured soup.
- Simmer for a further 5 minutes.
- Check and adjust the seasoning and consistency if required.
- Turn on the grill to its highest setting.
- Spoon into ovenproof bowls and scatter over the grated cheese.
- Place under the hot grill for a couple of minutes until the cheese is golden brown.