• 600g chopped red onions 
  • 60g olive oil
  • 4 tsp salt
  • 2 pinches of pepper
  • 60g balsamic vinegar
  • 60g butter
  • 1.2kg washed and sliced ​​brown mushrooms
  • 12 cloves of garlic
  • 4 tbsp. chopped tarragon
  • 60g red wine
  • 400g pre-cooked chestnuts
  • 400g baby spinach leaves
  • 80g panko/breadcrumbs
  • 1 beaten egg

For the shortcrust pastry

(or 2 store-bought rolls of shortcrust pastry)

  • 500g flour
  • 250g butter
  • 2 big pinches of salt
  • 2 eggs
  • 1 tbsp water


Prepare the shortcrust pastry the day before

Fit your food processor's bowl with the flat beater and pour in 250g of cold butter, 2 large pinches of salt and 500g of flour, and mix until a crumbly texture is obtained

Add 2 beaten eggs and mix gently

Add 1 tbsp of water, mix for a few seconds then gather the dough together with your fingertips and form a ball, then cover with clingfilm

Place in the fridge

Preheat the oven to 190°C

Pour 40g of olive oil into a pan, simmer over medium heat and brown the red onions with 2 tsp of salt until the onions turn clear (about 15-20 minutes)

Add 60g of balsamic vinegar and mix until evaporated

Set aside in a mixing bowl

In a large sauté pan, add 60g of butter and the sliced ​​mushrooms and cook until their jus is rendered

Add 12 chopped garlic cloves and 4 tbsp of chopped tarragon, mix and cook for 2 minutes

Cook on a high heat, add 60g of red wine and mix until evaporated

Chop up the chestnuts, add to the sauté pan then mix

Add the contents of the sauté pan to the red onions in the mixing bowl and let it cool

Heat 20g of olive oil in a pan, add the baby spinach leaves and cook until they soften, drain to remove as much water as possible from the spinach, roughly chop then add to the bowl of garnish

Add 80g of breadcrumbs to the mixing bowl as well as 2 tsp of salt, season with pepper and mix

Divide the shortcrust pastry into three parts and roll out each part to a thickness of 2mm.

With one part, cut a 24cm circle, place it on the removable bottom.

In the second part, cut 2 strips of 7cm high and place them on the edges of the mould, taking care to darken the edges

Pour the cooled filling onto the tart base

Cover with a 24cm diameter shortcrust pastry disc made with the third part and seal the edges well

You can decorate the top of the pie by making a slight incision in the dough with the tip of a knife and by placing a few pastry shapes that you have previously cut out with a biscuit cutter on the top

Using a brush, glaze the top of the pie with the beaten egg

Bake on the bottom shelf of the oven for 45 minutes at 190 degrees.

Remove from the oven and let it cool so that you can cut it sharply and neatly!

The result

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