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French onion spaghetti in a shallow white bowl with a black rim
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French Onion Spaghetti

All the flavour of French onion soup, turned into a rich, silky bowl of pasta
Course Main Course, pasta
Keyword caramelized onions, couple dinner, creamy pasta recipe, date night, french onion, french onion spaghetti, pasta recipe, spaghetti, spaghetti dish, spaghetti recipe
Prep Time 5 minutes
Cook Time 50 minutes
Servings 2 people

Ingredients

  • 1 tbsp olive oil
  • 3 tbsp butter
  • 2 yellow onions halved then sliced
  • Salt & black pepper
  • 2 sprigs fresh thyme
  • ¼ cup cognac
  • 1 tsp sherry vinegar
  • 1 tsp Worcestershire sauce
  • 1 cup beef stock
  • ½ cup heavy cream
  • ½ lb spaghetti
  • Garnish: freshly grated parmesan + fresh herbs (extra thyme, Italian parsley, or chives)

Instructions

  • In a large skillet over medium heat, melt the olive oil and butter together. Add the sliced onions and cook, stirring occasionally, until softened, about 5 minutes. Season with a generous pinch of salt and a few cracks of black pepper.
  • Continue cooking, stirring every few minutes, until the onions are deeply golden and caramelized, 30-35 minutes. During the last 5 minutes, add the thyme sprigs.
  • Meanwhile, bring a large pot of water to a boil. Salt it generously, then cook the spaghetti until al dente. Reserve ½ cup of the pasta water, then drain.
  • Lower the heat under the onions and remove the pan from the burner. Carefully add the cognac, then return the pan to low heat. Simmer for 2-3 minutes, scraping up any browned bits, until the alcohol cooks off.
  • Stir in the sherry vinegar, Worcestershire sauce, and beef stock. Increase heat to medium-low and let simmer until slightly reduced and thickened, about 5 minutes. Stir in the heavy cream and cook for 2 minutes more. Remove and discard the thyme sprigs.
  • Add the spaghetti directly to the sauce and toss to coat, adding a splash of reserved pasta water as needed to loosen the sauce to your preferred consistency.
  • Serve into bowls and top with grated Parmesan and fresh herbs.