• 50 g butter
  • 4 medium onions, thinly sliced
  • 1 clove garlic, thinly sliced
  • 1 sprig of thyme, leaves chopped, plus a few small sprigs
  • 100 ml dry white wine
  • 1.2 litres good-quality vegetable or chicken stock
  • 4 thick slices of French baguette, or other crusty bread
  • 125 g mature reserve Gruyère (or vegetarian alternative), finely grated


  1. 1

    Melt the butter in a large pan and cook the onions with 1 teaspoon of salt for 30 minutes, uncovered, stirring often, until caramelised.

  2. 2

    Add the garlic and thyme, then the white wine, and simmer until the wine has evaporated. Add the stock to the pan and simmer the soup, uncovered, for 30 minutes.

  3. 3

    Towards the end of the simmering time, preheat the grill to high. Lay the slices of bread on a baking sheet and grill on one side only until toasted. Remove from the grill, turn over and sprinkle the untoasted sides with grated Gruyère.

  4. 4

    Check the soup's seasoning and adjust if necessary, then pour into heatproof bowls. Top each serving with a slice of cheese-topped baguette and scatter over a few small thyme sprigs.

  5. 5

    Place the bowls under the grill until the cheese on the bread is bubbling and golden brown.

Nutritional Details

Each serving provides
  • Energy 1779kj 425kcal 21%
  • Fat 22.0g 31%
  • Saturates 13.4g 67%
  • Sugars 9.5g 11%
  • Salt 3.6g 60%

% of the Reference Intakes

Typical values per 100g: Energy 314kj/75kcal

Each serving provides

6.1g carbohydrate 0.7g fibre 3.5g protein

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