Cheese and Onion Tart

Feb 23, 2021 | 4 comments


Cheese and Onion Tart


Today’s recipe, by request, is for Onion Tart. Yet another recipe that I helped develop on the Cheap Family Recipes site. When I wrote this recipe, years ago, in 2013, CFR had disappeared and I made the savoury tart recipe using my notes. Consequently, it is different to the other version. You might like to check out that one as well! Incidentally, on repricing the recipe today, it’s cheaper than it was then!

We were inspired by Delia Smith’s Thick Onion Tart, frugalising it as we went along. I now dispense with the layers altogether, partly because I can’t be bothered and partly because I don’t think it makes any difference to the flavour or texture.

cheese and onion tart in dish

I never blind bake a 20cm sized tart as I dislike the over cooked taste it gives the edges of the pastry, and I don’t think it needs it. The pastry cooks perfectly fine, although I don’t like crisp tart bases. If you do, by all means blind bake the pastry

I make this for dinner time and time again, it is good hot, cold and in between. Great for packed lunches, picnics and feeding other people. We even had it at a WI lunch for 40+ people

I like to serve this with 80g carrots and peas per person if hot, and salad leaves from the garden with a mustardy vinaigrette if cold. If you want the calories, have a slice of crusty bread and butter with it, or some potatoes, hot or cold depending on the temp of the tart. Last time I made it, I roasted some carrot wedges with soy and sweet chilli sauce. That was good!

If you would like a vegan tart, omit the cheese and eggs and add some vegan cream. Similarly, if you would like to make an even cheaper budget recipe, omit the cheese.

You could swap the cheese for a strong blue version, or a mild cheddar, whatever you have to hand and like. Use half leeks and half onions for a change, or mix in some broad beans.

Swap out the milk for cream for a richer taste

Personally, I love the taste of grainy mustard. If you don’t, just leave it out

Uses for Caramelised Onions

onion skins

Caramelised onions are an extremely useful item to have about the kitchen. If you have any hummus, either shop bought or home made, try stirring in some of the onions. Caramelised onion hummus. Amazing! And a lot cheaper than in the shops.

Line some 10cm tartlet tins with pastry, or even jam tart tins, and fill with the onions, or the tart filling, for a mini savoury tart treat. Great for after school, elevenses or packed lunches. You could even roll out a slice of bread, cut to the tart tin size and use that instead of pastry.

Or pile the caramelised onions onto a rolled out sheet of puff pastry, with or without cheese mixed in or on top, and bake for a speedy supper


Cheese and onion tart
cheese and onion tart on plate

Cheese and Onion Tart

Enjoy hot from the oven, warm or cold
5 from 1 vote
Prep Time: 10 mins
Cook Time: 30 mins
caramelising the onions: 45 mins
Total Time: 1 hr 25 mins
School Lunches
budget meals
cheap family recipes
freeze by Hare Krishna from the Noun Project
Freezes Well
No Nuts by Llisole from the Noun Project
Nut Free
Servings: 4
Cost per portion 37p a serving
Calories: 494kcal
Author: Thrifty Lesley
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  • 100 g flour self raising
  • 2 tsps mustard optional
  • 40 g cheese optional
  • 40 ml oil NB oil does not weigh the same in ml and grams
  • 40 ml cool water or up to 60ml, you may not need it all


  • 700 g onions
  • 50 g butter
  • 2 large eggs
  • 110 ml milk
  • 60 g cheese optional



  • Put the flour and oil into a mixing bowl
  • Add the cheese and mustard if using
  • Add the water. You may need a little more or a little less depending in the flour, they are all different
  • Stir gently until amalgamated to make the pastry
  • Cover and leave to rest while you cook the onions


  • Slice up all the onions. I tend to slice them into half rings when doing this rather than the usual little chopped pieces, don’t know why, it just seems right!
  • Put them in a frying pan with 50g butter, yes, I know it’s a lot, but it is one of the main flavourings. Saute the onions for about 30-45 minutes, until they are a dark brown colour. Stir every now and again in case they start to stick, if they do, add just a splash of water
  • Once the onions are cooked, leave them to cool until warm, if not completely cold.
  • Whisk the eggs, milk and mustard together and add to the cooled onions. The onions need to be cool or they will scramble the eggs


  • Bake at 180°C Fan / 200°C / 400°F / Gas Mark 6 for about 30 minutes until the filling is cooked through and firm
  • Enjoy hot from the oven, warm or cold


Nutrition Facts
Cheese and Onion Tart
Amount Per Serving
Calories 494 Calories from Fat 288
% Daily Value*
Fat 32g49%
Saturated Fat 14g88%
Trans Fat 1g
Cholesterol 149mg50%
Sodium 328mg14%
Potassium 384mg11%
Carbohydrates 37g12%
Fiber 4g17%
Sugar 9g10%
Protein 15g30%
Vitamin A 748IU15%
Vitamin C 13mg16%
Calcium 274mg27%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.
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  1. Lesley

    Thanks Ron, got a few more recipes going up in the next few days with the Aldi bargains. I’m glad you liked the tart 🙂

  2. RON

    Hi, just to say thank you, love your site and will pass it on to everyone I can, we loved
    the onion tart, had it last night SUPERB, having it again for lunch, keep up the
    good work, thanks RON

  3. Lesley

    You’re welcome, hope you like it 🙂

  4. Sooze

    Thank you, I’ll definitely make this

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