Mornay onion tart


Mornay onion tart
In a shortcrust pastry base, a rather thick onion tart, where onions and lardons are deliciously bound with a Mornay sauce.
3,039 5.0/5 based on 27 reviews
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Last modified on: June 23th 2024

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For 6 people, you will need:

Change to the quantities for: 2 people 3 people 6 people 12 people 18 people
How long will it take?
Time required for this recipe:
PreparationCookingStart to finish
1 hour 3 min.1 hour 11 min.2 hours 14 min.
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Step by step recipe


Stage 1 - 20 min.
Mornay onion tart
Roll out 300 g Shortcrust pastry (pâte brisée) then line a 22 cm (9-inch) diameter high-sided baking tin, which you will have placed on a sheet of baking paper in a baking tray.

Leave any excess dough around the edges, then place in the fridge to set aside.

Stage 2 - 10 min.
Mornay onion tart
Prepare and slice 1 kg onion (a mandolin is ideal for this).
This may seem like a lot, but don't worry, they'll reduce when cooked.

Stage 3 - 3 min.
Mornay onion tart
In a large saucepan over medium heat, melt 50 g butter, and when hot, add the onions.

Season with salt and stir well.

Cover for the first 5 minutes.

Stage 4 - 10 min.
Mornay onion tart
Leave to cook until the onions are tender, checking the salt seasoning as cooked onions tend to be a little sweet.

Stage 5 - 5 min.
Mornay onion tart
Your onions should be fairly dry, with little or no cooking juices.
If this isn't the case, because they've given off a lot of water during cooking, drain them in a fine sieve.

Set aside.

Stage 6 - 3 min.
Mornay onion tart
Preheat oven to 200°C (390°F).

Cut 150 g smoked pork belly (or thick cut streaky bacon) into small pieces.

Stage 7 - 8 min.
Mornay onion tart
Toast them, without adding fat, in a small frying pan over medium heat.

Stage 8 - 1 min.
Mornay onion tart
When toasted to your liking, add 4 tablespoons vinegar, and stir until evaporated.

Stage 9 - 2 min.
Mornay onion tart
It's not essential, but I recommend adding 2 or 3 spoonfuls of already-cooked onions to the pan at the end of cooking, then stirring well to capture all the flavor of the grilled bacon.

Stage 10 - 2 min.
Mornay onion tart
Pour the lardons + onions into the remaining onions and mix well.

Stage 11 - 2 min.
Mornay onion tart
Add 300 g Mornay Sauce and mix well.

Stage 12 - 20 min.
Mornay onion tart
Take the pastry mould out of the fridge, cut the excess pastry around the edges of the mould, place a sheet of baking paper on the bottom and fill with ceramic balls (or similar).

Bake at 200°C (390°F) for 20 minutes.

Stage 13 - 5 min.
Mornay onion tart
In the meantime, you can roll out the pastry scraps into small strips to decorate the tart.

Stage 14 - 1 min.
Mornay onion tart
After 20 minutes, remove the baking tray from the oven...

Stage 15 - 5 min.
Mornay onion tart
... and remove paper and beads.

Stage 16 - 2 min.
Mornay onion tart
Fill the tart with the onion-lardon-Mornay mixture.

Stage 17 - 2 min.
Mornay onion tart
If you have made some, place the pastry strips on top.

Stage 18 - 3 min.
Mornay onion tart
Sprinkle with a little grated cheese.

Stage 19 - 30 min.
Mornay onion tart
Bake for a further 30 minutes.

Stage 20
Mornay onion tart
Enjoy warm or hot, on its own or with a small green salad.
Remarks
If you find your onions a little too soft at the end of cooking, you can add a good glass of dry white wine.

If you don't have a Mornay sauce, use a Béchamel sauce to which you can add grated cheese to taste.

You'll notice that in this recipe, the onions are cooked without coloring, but if you prefer, you can caramelize them. In this case, increase the weight of onions to 1.5 kg, as they will reduce even more.
Keeping
1 or 2 days in the fridge, protected by cling film.
Source
Home made.
Nutritional information
Whole recipe
Energetic valueProteins CarbohydratesFats
3,419 Kcal or 14,315 Kj359 gr1,494 gr1,284 gr
171 %138 %141 %195 %
Per 100 g
Energetic valueProteins CarbohydratesFats
181 Kcal or 758 Kj19 gr79 gr68 gr
9 %7 %7 %10 %
Per person
Energetic valueProteins CarbohydratesFats
570 Kcal or 2,386 Kj60 gr249 gr214 gr
28 %23 %23 %32 %
% are calculated relative to a Recommended Dietary Intake or RDI of 2000 k-calories or 8400 k-joules by day for a woman (change to a man).
Possible allergens in this recipe: Gluten, Milk, Egg, Sulfites
How much will it cost?
  • For 6 people : 5.37 €
  • Per person : 0.90 €

Change currency:

Note: Be careful, these prices are only an estimate, you can consult the table of prices by ingredients used for this estimate.
This recipe uses (among others)
OnionOnion: You can get more informations, or check-out other recipes which use it, for example: Cretan Bread, Paté en croute (terrine in a pie crust), Mixed vegetable curry, Stuffed tomatoes and courgettes, Pumpkin and red-bean tortillas, ... All
Mornay SauceMornay Sauce: You can get more informations, or check-out other recipes which use it, for example: Spinach Mornay, Small green vegetables in Mornay sauce, ... All
Shortcrust pastry (pâte brisée)Shortcrust pastry (pâte brisée): You can get more informations, or check-out other recipes which use it, for example: Black sesame flan, Salmon and leek fondue tart, French custard tart, Deep leek and potato quiche, Paté en croute (terrine in a pie crust), ... All
Smoked pork belly (or thick cut streaky bacon)Smoked pork belly (or thick cut streaky bacon): You can check-out other recipes which use it, like for example: Express sauerkraut, Soup Cornouaillaise, Boeuf (beef) bourguignon, Warm lentil salad, ... All
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