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French Onion Soup Recipe

Share this recipe

French Onion Soup Recipe

Introduction

Earthy, bold, and brimming with flavour, there’s nothing quite like a bowl of classic French onion soup to warm you up. Slow-cooked caramelised onion creates a rich, sweet base that’s perfectly balanced with a full-bodied broth. Topped with slices of toasted French Breadstick and bubbling melted Gruyere, this rustic French soup delivers comfort with every spoonful. It’s a simple, satisfying recipe that transforms a handful of everyday ingredients into something special.

Ingredients

Method

1
Peel the brown onions and slice as thinly as you can, either using a sharp knife or a mandoline
2
Place the butter and sliced onions in a large, heavy-based pot, turn the heat on to medium and stir until the butter has completely melted.
3
Cook the onions over medium heat, stirring every few minutes, for around 45 minutes or until the onions are deeply browned; this deep caramelisation will enhance the flavour of your finished soup
4
Once the onions are ready, add in the Worcestershire sauce, wine and thyme and simmer for 5 minutes to infuse the flavour in the onions, before adding in the stock and bay leaves and simmering for another 15 minutes
5
Remove from the heat and stir through the sherry vinegar; season to taste with salt and pepper
6
Turn the grill on and top each slice of French Breadstick with 20g of grated gruyere cheese and a sprinkle of fresh thyme. Grill until the cheese is melted and the edges of the bread are golden. Ladle the soup into a deep bowl and top with a slice of the cheesy breadstick. Serve immediately
FAQs

The secret to great French onion soup lies in taking your time with the caramelised onion. Slowly cooking the onions for up to 45 minutes allows their natural sugars to develop, creating deep, rich flavour. Rushing this step often leads to sharpness rather than sweetness. Using a heavy-based pot helps distribute the heat evenly so the onions cook gently without burning, building that signature sweet, savoury base for this classic winter soup.

A sturdy, crusty bread like French Breadstick or a traditional baguette works perfectly for a French onion soup recipe. The bread should be firm enough to hold its shape under the weight of the melted cheese and soak up just enough broth without falling apart. Toasting it in the air fryer or oven before adding the cheese ensures a golden, crunchy top while still giving you that satisfying softness once submerged in the soup.

No extra sugar is needed when making caramelised onion for French onion soup. Onions contain natural sugars that break down and caramelise slowly with heat. Patience is key, and cooking them low and slow allows the sugars to develop fully, giving you that rich, sweet flavour naturally without any added sugar.