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Oven proof dish filled with sliced potatoes and onions topped with green parsley leaves.

Ultimate Potatoes Lyonnaise

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  • Author: Judith Coates
  • Total Time: 1 hour, 38 minutes - 1 hour, 43 minutes
  • Yield: 4 1x


This dish is a classic French dish appreciated for its simplicity and savory flavor that features thinly sliced potatoes cooked with onions, herbs, and butter until they are golden and crispy. 


Units Scale
  • 3 large onions, sliced
  • 2 tablespoon olive oil
  • 50 gram unsalted butter
  • 1 kilogram medium potatoes, like Desiree or Maris Piper, peeled
  • 2 tablespoon finely chopped flatleaf parsley, plus extra to serve
  • 2 tablespoon fresh thyme leaves, plus extra to serve if you like
  • 2 garlic cloves, thinly sliced
  • salt and freshly ground black pepper


  1. Place the sliced onions, garlic, olive oil and half the butter in a large frying pan. Cook over a low-medium heat until the onions are soft but not golden-brown yet, this might take up to 30–35 minutes.
  2. Meanwhile bring a large pan of salted water to the boil. Slice the potatoes into 5mm/.25 inch thick slices. Once the water is boiling, add the potatoes and when the water has returned to a boil, set your timer for 3 minutes. Drain immediately and leave in the colander to steam dry. 
  3. When the onions are done, remove from the heat and stir in the parsley and thyme and season well. Gently toss the onion mixture and par-boiled potatoes together, you can do this in the frying pan if they fit, or a large mixing bowl.
  4. Tip everything into a large baking dish, you don’t want the mixture to sit any deeper than 5cm/2 inch. Arrange and press the top down a little to roughly flatten. Dot the remaining butter all over the top.
  5. Heat the oven to 200°C/180°C/Gas 6.
  6. Bake for 45 minutes, or until the potatoes are  cooked through. A little extra garnish of chopped parsley and fresh thyme is nice, but not strictly necessary.


You can prepare up to Step 4 several hours in advance.

  • Prep Time: 20 minutes
  • Cook Time: 1 hour, 18 minutes - 1 hour, 23 minutes
  • Category: potato dish
  • Method: stove top/oven
  • Cuisine: French