A French classic, and a great recipe to have up your sleeve, this French onion soup ticks all our boxes. Go the traditional route and melt the cheese onto floating croutons (a great way to use up stale bread), or switch it up and try our irresistible greyere toasties to dunk whilst you eat!
Based on 4 servings, adjust as needed.
Melt butter in a large pot on a medium-low heat. Finely slice the onions and sweat in the butter with a large pinch of salt for 15-20 minutes until caramelised. Cover with a lid if you have one and keep stirring every so often to ensure they don’t stick to the base of the pan. If they’re catching, add a splash of water to release them. Once the onions have softened, remove the lid and increase the heat to colour them slightly. You can add a tsp of sugar to aid the caramelisation process if you wish.
Add in cloves of chopped garlic and cook for a further 2 minutes. Then add plain flour, give it a good stir and cook this for 1 minute.
Pour in the 190ml White Wine and bubble away until half has evaporated. Then add the beef stock and Worcestershire sauce and simmer for 10 minutes. Check for seasoning.
To assemble your toasties, spread dijon mustard (if using) over one slice of sourdough bread then top with a handful of grated gruyere cheese. Cover with another slice of bread and fry in a hot pan with butter, flipping over once golden, until crispy on both sides. Repeat this for the other 3 toasties. *Alternatively, top one slice of bread with the mustard and cheese and simply melt under the grill until bubbling. Place this straight on top of each portion of soup.
Cut your toasties in half and portion out the soup into bowls. Dunk your melted toastie into the soup as you eat!