Mornay onion tart
In a shortcrust pastry base, a rather thick onion tart, where onions and lardons are deliciously bound with a Mornay sauce.
14 K 5.0/5 (27 reviews)
2 hours 15 min.
Easy
6 people
7 IngredientsLast modified on: June 23th 2024
For 6 people, you will need:
- 1
300 g shortcrust pastry (pâte brisée) - 2
1 kg onion - 3
50 g butter - 4
150 g smoked pork belly (or thick cut streaky bacon) - 5
4 tablespoons vinegar - 6
300 g mornay sauce - 7
30 g grated cheese - Total weight: 1,890 grams
Change measures:
Times for this recipe
Preparation: 1 hour 3 min.
Cooking: 1 hour 15 min.
All in all: 2 hours 15 min.
If you start now, at , you will finish around : ?.Change start time
To finish around 7pm, you'll need to have started before: .Change end time
Step by step recipe
Stage 1 - 20 min.
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.
Leave any excess dough around the edges, then place in the fridge to set aside.
Stage 2 - 10 min.
Stage 3 - 3 min.
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.
Season with salt and stir well.
Cover for the first 5 minutes.
Stage 4 - 10 min.
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.
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.
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.
Preheat oven to 200°C (390°F).
Cut 150 g smoked pork belly (or thick cut streaky bacon) into small pieces.
Cut 150 g smoked pork belly (or thick cut streaky bacon) into small pieces.
Stage 7 - 8 min.
Toast them, without adding fat, in a small frying pan over medium heat.
Stage 8 - 1 min.
When toasted to your liking, add 4 tablespoons vinegar, and stir until evaporated.
Stage 9 - 2 min.
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.
Pour the lardons + onions into the remaining onions and mix well.
Stage 11 - 2 min.
Add 300 g mornay sauce and mix well.
Stage 12 - 20 min.
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.
Bake at 200°C (390°F) for 20 minutes.
Stage 13 - 5 min.
In the meantime, you can roll out the pastry scraps into small strips to decorate the tart.
Stage 14 - 1 min.
After 20 minutes, remove the baking tray from the oven...
Stage 15 - 5 min.
... and remove paper and beads.
Stage 16 - 2 min.
Fill the tart with the onion-lardon-Mornay mixture.
Stage 17 - 2 min.
If you have made some, place the pastry strips on top.
Stage 18 - 3 min.
Sprinkle with a little grated cheese.
Stage 19 - 30 min.
Bake for a further 30 minutes.
Stage 20
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.
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
| Proteins (gr) | Carbohydrates (gr) | Fats (gr) | Energy value (in k-calories) | Energy value (in k-joules) | |
|---|---|---|---|---|---|
| Whole recipe | 360 RDI=140 % | 1,490 RDI=140 % | 1,280 RDI=200 % | 3,420 RDI=170 % | 14,320 RDI: 170 % |
| Per 100 g | 20 RDI=7 % | 80 RDI=7 % | 70 RDI=10 % | 180 RDI=9 % | 760 RDI: 9 % |
| Per person | 60 RDI=20 % | 250 RDI=20 % | 210 RDI=30 % | 570 RDI=30 % | 2,390 RDI: 30 % |
How much will it cost?
- For 6 people : 5.40 €
- 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)
Onion
Like these other recipes: Mexican ceviche, Green beans with tomato and cheddar cheese, French onion soup, Ardennes Salad, Crispy spinach rolls, ... See them all 148
Shortcrust pastry (pâte brisée)
You can get more informations, or check-out other recipes which use it, for example: Mexican tart, Salmon and leek fondue tart, Quiche Lorraine, Black sesame flan, Angevin plum pâté, ... See them all 15
Mornay Sauce
You can get more informations, or check-out other recipes which use it, for example: Manou's zucchinis garnished, Small green vegetables in Mornay sauce, Eggs Florentine, Spinach Mornay, ... See them all 4
Smoked pork belly (or thick cut streaky bacon)
Like these other recipes: Soup Cornouaillaise, Warm lentil salad, Boeuf (beef) bourguignon, Express sauerkraut, Dandelion salad, ... See them all 5
Other recipes you may also like
Hollandaise sauce
This sauce is quite similar to Béarnaise sauce, but with a light lemon flavour. It can be used hot, warm or cold on several things: vegetables, fish, eggs... Not easy to get right, like all "emulsified warm sauces" (Béarnaise, Hollandaise, etc.), but you will find all the tips you need here.July 25th 2019243 K 14.7 25 min.
Red cabage salad with toasted almonds
This salad has a lovely crunch to it: not just the red cabbage, but also from thinly sliced radishes and toasted almonds.May 26th 201943 K5 30 min.
Chocolate tart
As you can see, there's very little added sugar in this recipe, so it's a very chocolatey and bitter-sweet tart.November 16th 2013295 K 15 2 hours 30 min.
Exotic fruit tart
An exotic fruit tart (bananas, kiwi and pineapple), with crisp pastry and almond cream which are cooked beforehand. It's a rather simple recipe, but the final result will impress your guests.May 27th 2020322 K5 2 hours 25 min.
Crème brulée
Crème brûlée (burned cream) is quite easy to prepare: it's a simple egg-cream dessert. The only difficulty is in making the delicious crunchy caramel layer on top. The perfect crème brulée (for me) is a cold and soft cream, with on top a nice hot caramel crust. This is a completely new version...December 31th 20111.66 M 74.3 4 hours 40 min.
News list of cooking-ez.com
Sign up to receive the latest recipes (next batch due to be sent on 2025-05-18)
Note: We'll never share your e-mail address with anyone else.
Post a comment or question
Follow this recipe
If you are interested in this recipe, you can "follow" it, by entering your email address here. You will then receive a notification immediately each time the recipe is modified or a new comment is added. Please note that you will need to confirm this following.
Note: We'll never share your e-mail address with anyone else.
Alternatively: you can subscribe to the mailing list of cooling-ez.com , you will receive a e-mail for each new recipe published on the site.