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Belgian Onion Soup

This Belgian onion soup is a sophisticated, vegetarian twist on the traditional French classic. By using Trappist ale, specifically Chimay Blue, the broth develops a remarkable depth of flavour that balances the natural sweetness of the slowly caramelised onions and shallots. The result is a dark, savoury and incredibly fragrant soup that feels both indulgent and deeply comforting, perfect for chilly autumn evenings or a slow-paced weekend lunch.

For the best results, serve this hearty dish in individual oven-proof bowls topped with thick slices of toasted sourdough and plenty of nutty Gruyère cheese. Grilling the bread and cheese directly on top of the soup creates a bubbling, golden crust that is essential for the authentic experience. While delicious when made fresh, the flavours mature beautifully if left in the fridge overnight and reheated the following day.

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Ingredients for Belgian Onion Soup

  • 2 cucharadas de mantequilla

  • 2 tablespoons of extra virgin olive oil

  • 5 large onions, halved and sliced thin

  • 6 cloves of garlic, minced

  • 4 shallots, sliced thin

  • 750 milliliter Chimay Blue

  • 4 cups vegetable stock

  • 4 hojas de laurel

  • 6 sprigs of thyme

  • 1/2 teaspoons ground white pepper

  • 4 slices sourdough bread for garnish

  • 230g Gruyère cheese for garnish

  • Sea salt to taste

  1. Heat a wide pot or cast-iron on medium heat. Add the butter and let it blister.

  2. Add the onion and cook uncovered. Let them sit for about four minutes and then stir. Repeat until the onions have all begun to brown, at least twenty minutes.

  3. Add the olive oil, garlic, and shallots and stir in the same fashion as before, once every five minutes, until the garlic and shallots have caramelized.

  4. Add 600ml the beer and crank the heat to just shy of high. Let the beer boil off until there is half as much beer volume as onion volume.

  5. Add the stock, bay leaves, thyme leaves, and white pepper. Cook until the liquid has reduced by about two finger widths. Taste the soup and add salt to adjust. Cook for at least an additional twenty minutes before garnishing. In an ideal world, you would let the soup sit a day before serving it. (Just be sure to reheat it.)

  6. Take a slice of sourdough and cut it to fit your bowl or cup. Set atop the soup and cover with several slices of Gruyère. Grill until brown and serve hot, topped with extra thyme.

Descargo de responsabilidad

Si bien se ha hecho todo lo posible para garantizar que la información sea precisa y esté actualizada, las necesidades individuales pueden variar y los requisitos dietéticos pueden diferir según las condiciones de salud personales. Siempre revise las etiquetas de los alimentos y la información sobre alérgenos antes de preparar o consumir cualquier receta. Si tiene preocupaciones específicas de salud, alergias, intolerancias o sigue una dieta prescrita médicamente, busque el consejo de su médico de cabecera, farmacéutico o un dietista registrado antes de realizar cambios significativos en su dieta o estilo de vida.

Historial del artículo

La información en esta página es revisada por pares por clínicos calificados.

  • 28 Ene 2026 | Publicado originalmente

    Escrito por:

    Editores de recetas del Reino Unido

    Revisado por pares por

    Editores de recetas del Reino Unido
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