Old School Cornflake Tart – The Classic Recipe with Custard

Ask anyone who went to school in Britain to name a school dinner pudding and the cornflake tart comes up within the first three answers. A slice of crisp pastry, a thin layer of jam that had gone slightly warm and loose, a golden, sticky, crunchy cornflake topping – and all of it half-floating in custard poured from a metal jug. Dinner ladies made it in trays the size of a table, and there was never enough for seconds.

It’s also one of the easiest nostalgic bakes to get right at home, because there’s no real baking skill involved beyond a pastry case – and shop-bought pastry is genuinely fine here. The school kitchens used catering-block pastry; nobody was rubbing in butter by hand. What matters is the ratio of the topping (enough syrup to bind, not so much it goes soft), the jam layer going onto warm pastry, and serving it the only correct way: warm, with custard.

What is a cornflake tart?

A cornflake tart is a British school-dinner dessert: a blind-baked shortcrust pastry case, spread with raspberry or strawberry jam, topped with cornflakes bound in melted butter, golden syrup and brown sugar, and returned to the oven briefly so the topping toasts golden. It’s served in slices, warm or cold, traditionally with custard.

It belongs to the great family of jam-and-something school tarts – cousin to the Manchester tart (jam and custard) and the gypsy tart (evaporated milk and muscovado) – and it dates from the era when school kitchens built puddings from whatever the store cupboard held: flour, jam, syrup and a box of cereal. Like the chocolate cornflake traybake, it turned the humble cornflake into pudding – but where the traybake is a no-bake chocolate treat, the tart is a proper baked pudding with pastry and jam.

Why this recipe works

• The jam goes on while the pastry is warm. It loosens and spreads thin without tearing the case, and it half-sets into the pastry as it cools – that’s the school-dinner texture.
• Golden syrup, butter AND brown sugar in the topping. Syrup alone slides off and never quite sets; the butter and sugar make a soft toffee that grips the flakes and toasts in the oven.
• A short second bake. Five to eight minutes toasts the cornflakes and sets the topping so it cuts in slices instead of tumbling apart – the step most home versions skip.
• Ready-made pastry is allowed. The schools didn’t make artisan pastry and neither must you. A 320g sheet of shortcrust is completely authentic to the spirit of the thing.
• Served warm, with proper custard. Cold from the fridge it’s a flapjack in a pastry case. Ten minutes in a low oven and a jug of custard turn it back into the pudding you remember.

Ingredients

For the pastry (23cm tart tin, serves 8):

• 250g plain flour
• 125g cold unsalted butter, cubed
• A pinch of salt
• 3–4 tablespoons cold water

(Or: 1 × 320g sheet of ready-rolled shortcrust pastry – no shame, see the FAQ.)

For the filling and topping:

• 150g raspberry jam (or strawberry)
• 50g unsalted butter
• 100g golden syrup
• 30g light brown sugar
• 100g cornflakes

For the custard:

• 500ml whole milk
• 4 egg yolks
• 2 tablespoons caster sugar
• 1 tablespoon cornflour
• 1 teaspoon vanilla extract

(Custard from a tin or powder is period-accurate – the schools never separated an egg in their lives.)

How to make a cornflake tart

1. Make and chill the pastry

Rub the butter into the flour and salt until it looks like breadcrumbs, add the cold water a spoonful at a time and bring it together into a firm dough. Wrap and chill for 30 minutes. (Ready-rolled: straight to step 2.)

2. Blind bake the case

Heat the oven to 180°C / 160°C fan / gas 4. Roll the pastry out to line a 23cm tart tin, prick the base, line with baking paper and fill with baking beans (or dried rice). Bake for 15 minutes, remove the paper and beans, and bake 5 minutes more until the base is dry and lightly golden.

3. Jam the base

While the case is still warm, spread the jam evenly over the base. The warmth loosens it so a thin, even layer covers everything without dragging the pastry.

4. Make the cornflake topping

Melt the butter, golden syrup and brown sugar together in a large pan over a low heat, stirring until the sugar dissolves. Take it off the heat, tip in the cornflakes and fold gently until every flake is coated – fold, don’t stir, so the flakes stay whole.

5. Top and toast

Spoon the cornflake mixture over the jam and nudge it out to the edges without pressing down hard. Return the tart to the oven for 5–8 minutes, until the topping is deep golden and smells of toffee. Cool in the tin for at least 20 minutes before slicing – the topping sets as it cools.

6. Make the custard

Warm the milk to steaming. Whisk the yolks, sugar and cornflour in a bowl, pour the hot milk over, whisking, then return everything to the pan on a low heat and stir until it thickly coats the back of a spoon – 3 to 4 minutes. Off the heat, stir in the vanilla.

Serving it the school way

Warm slices, custard poured around and over so the pastry edge stays crisp while the underside goes fudgy – that contrast is the whole memory. If you want the full 1980s dinner-hall experience, make it pink custard: stir a few drops of pink food colouring and a little raspberry flavouring into the custard, exactly as the dinner ladies did for the sprinkle sponge.

Cold, a slice holds together like a flapjack and travels well in a lunchbox – also correct, also delicious.

Troubleshooting

The topping is rock-hard. The syrup mixture boiled too long, or the tart over-baked on the second trip to the oven. Melt the butter, syrup and sugar gently – it should never bubble hard – and pull the tart when the flakes are golden, not brown.

The topping never set and slides off. Not enough of the butter-sugar toffee to bind, or the second bake was skipped. Weigh the syrup (100g is about 3 generous tablespoons) and give it the full 5–8 minutes back in the oven.

Soggy pastry. The case wasn’t fully blind-baked before the jam went on. Bake it until the base is properly dry and sandy to the touch – a pale, damp base can’t survive jam and syrup on top.

The jam boiled out over the topping. Too thick a jam layer, or the oven too hot on the second bake. 150g is a thin, even coat – it should barely cover the base.

The cornflakes went soft the next day. They will, slightly – that’s authentic. Keep the tart uncovered or loosely covered at room temperature rather than sealed in a tin, and re-crisp slices in a low oven for 5 minutes.

Variations

• Treacle cornflake tart – swap 25g of the golden syrup for black treacle for the darker, almost burnt-toffee version some schools made. (A full treacle swap is overpowering.)
• No-pastry cornflake tart – press the topping straight into a lined 20cm tin over a thin layer of jam and chill; it becomes a jam-and-cornflake traybake. Quicker, and what some schools actually did.
• Chocolate cornflake tart – stir 2 tablespoons of cocoa into the syrup mixture. Half tart, half chocolate concrete energy.
• Deeper jam layer – some counties did 250g of jam and less topping. If your school was one of them, you’ll know.

Storage

Keep the tart loosely covered at room temperature for up to 3 days – the fridge makes the pastry damp and the topping chewy. Re-warm slices at 150°C for 5–10 minutes before serving with custard. The custard keeps, covered with clingfilm touching its surface, for 2 days in the fridge; it doesn’t freeze, but the tart itself freezes well for up to 2 months, wrapped in slices.

Frequently asked questions

How do you make cornflake tart like school dinners? Exactly as above: blind-baked shortcrust, a thin layer of raspberry jam on the warm pastry, cornflakes bound in melted butter, golden syrup and brown sugar, and a short second bake to toast the top. The custard on the side is non-negotiable.

Can I use ready-made pastry? Yes, and you’re in good company – school kitchens used catering pastry blocks. A 320g ready-rolled shortcrust sheet fits a 23cm tin. Blind bake it just the same.

Can I make a cornflake tart without pastry? Yes – press the jam and topping into a lined tin and chill instead of baking. It becomes a cornflake traybake: less school-dinner, still very good. If that’s more your thing, the chocolate cornflake traybake is the fully no-bake version.

Jam first or cornflakes first? Jam first, always, directly on the warm pastry. Cornflakes on the bottom would soak and go soft; the jam layer is what keeps the topping tasting of toffee and the base tasting of jam.

Which jam is traditional? Raspberry or strawberry, seedless if you can. The schools bought whichever red jam came in the biggest tin.

Is cornflake tart the same as treacle tart? No – a treacle tart is a soft filling of golden syrup and breadcrumbs baked in pastry, no cornflakes. The cornflake tart’s topping stays crunchy. If your memory says the school version was darker and stickier, your kitchen was making the treacle variation above.

Why is my school pudding memory pink? Pink custard – regular custard with pink colouring and a drop of raspberry flavour, poured over cornflake tart, sprinkle sponge and anything else that stood still. The variation is in the serving section.

More school dinner puddings

The cornflake tart sits in our Classic British Bakes & Puddings collection with the rest of the dinner-hall greats: the gypsy tart, the butterscotch tart, Manchester tart, chocolate concrete and the sprinkle sponge with pink custard.