School Days Chocolate Concrete

Chocolate concrete cake will take you straight back to your school days! This four ingredient chocolate crunch recipe is SO EASY and tastes insanely good. Serve warm with pink custard or just grab a slice – so yummy 🙂

You will also LOVE my Chocolate School Cake!

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Fancy taking a trip down memory lane? Chocolate concrete – or chocolate crunch – doesn’t sound super appetising but this old school recipe is as easy as it is yummy!

The crunch from the sugar topping giving way to a chocolate hit from the cocoa – just pure joy through and through. I’d say this is tied with my School Cake in nostalgia stakes.

Here’s why this is a MUST BAKE

• Only FOUR ingredients you probably already have!
• Vegan if you use vegan butter (or Stork)
• So quick – ready in under 30 minutes
• Perfect for baking with your kids 

Chocolate Concrete or Chocolate Crunch?

Chocolate crunch and chocolate concrete are one and the same. Some people like this crunchy chocolate cake served with pink custard (made using Pearce Duff’s strawberry blancmange powder for authenticity).

The chocolate crunch hardens to chocolate concrete as it cools. If you slice it warm straight out of the oven the texture will be slightly softer. I prefer just to grab a cold slice as a sweet treat – great with a cup of coffee or tea!

Cake or biscuit?

Technically this is a type of shortbread biscuit. Since the recipe contains no eggs and no rising agents it stays pretty flat. It is also easily vegan – just use Stork instead of butter.

Some chocolate concrete recipes contain eggs and baking powder – this to me is more of a cake and softer in texture… not really concrete / crunchy.

Cocoa Powder or Hot Chocolate Powder?

Unsweetened cocoa powder will give your crunch a deeper chocolatey flavour. But don’t go buying the best organic super-dark cocoa powder. I like using the more economical Cadbury Bournville Cocoa in this recipe.

You CAN use drinking chocolate powder in a pinch, but your concrete won’t look as dark and the chocolate taste won’t come through as strongly.

Chocolate Concrete Recipe Step by Step

Full measurements and instructions can be found on the printable recipe card at the bottom of the page. Please take a look at the steps and video before attempting this recipe!

Heat the oven to 180C (350F) or 160C (325F) if you are using the fan setting. Line a square tin with baking paper and grease with butter or spray with cake release.

Mix the flour, sugar and cocoa using a fork or wire whisk until lump free and uniform in colour. You can also sift the dry ingredients into your bowl.

Melt the butter or Stork (in a pan or use the microwave) and pour into the bowl. Stir using a fork then use your hands to rub the butter into the dry ingredients until you have a crumbly sandy texture.

Tip the mixture into your prepared tin and spread out. Place your hand inside a sandwich bag and press down hard to flatten the mixture or use the back of a spoon. It needs to be packed down into an even layer. 

Bake for 20 minutes. Remove from the oven and mist the hot chocolate concrete cake with a little water (I used a spray bottle) and sprinkle with the sugar. 

I like to slice the crunch cake while it is still a little warm. I cut mine into triangle shapes but you can cut into squares or whatever you like.

Cool on a wire rack and grab a slice as a sweet treat or serve with pink custard. Once cool keep any slices in an airtight container.

Looking for more retro school day treats?

Chocolate Victoria Sponge Cake

Chocolate Victoria Sponge Cake is a glorious chocolatey twist on the classic sandwich cake. Super-easy to make and delicious sandwiched chocolate frosting or jam and whipped cream.

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Retro School Dinner Cake

This old fashioned school cake topped with a simple glaze and sprinkles is just the simple retro bake we all need right now! Easy to make all in one bowl and delicious served plain or with warm vanilla custard.

Make sure all your cake ingredients are at room temperature before starting this recipe.

Read More

Chocolate School Cake

Chocolate School Cake – this chocolate version of the popular school cake recipe is easy to make and super delicious! Perfect for sharing at a childrens’ birthday party or a bake sale.

Read More

Tottenham Cake

Tottenham Cake with bright pink icing – so easy to make all in one bowl, delicious and perfect for sharing! Make sure all your cake ingredients are at room temperature before starting this recipe.

Read More

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School Days Chocolate Concrete with Pink Custard

Lucy Parissi | Supergolden Bakes

Chocolate concrete cake will take you right back to your school days! This four ingredient chocolate concrete recipe is SO EASY and tastes insanely good. Serve warm with pink custard or just grab a slice – so crunchy 🙂

4.60 from 27 votes

Print Rate

Course: Cookies and Bars, School Treats

Cuisine: British

Keyword: Chocolate Concrete, Chocolate Crunch

Prep Time: 5 minutes

Cook Time: 20 minutes

Total Time: 25 minutes

Servings: 16 small slices

Calories: 184kcal

Ingredients

For the Chocolate Concrete

• ▢ 240 g (2 cups) flour (plain/all purpose)
• ▢ 225 (1 cup+ 2 tbsp) granulated sugar I used Golden Granulated
• ▢ 60 g (8 tbsp) unsweetened cocoa powder
• ▢ 115 g (½ cup) unsalted butter / Stork use Stork or a vegan spread if preferred

Topping

• ▢ 2 tbsp granulated sugar
• ▢ 1 tbsp pink sanding sugar (optional – just looks pretty!)

Pink Custard

• ▢ 600 ml (2 ½ cups) whole milk
• ▢ 1 packet strawberry blancmange powder (Pearce Duff’s)
• ▢ 3 tbsp caster sugar (or to taste)

Instructions

Chocolate Concrete

• Preheat the oven to 180C (350F) or 160C (325F) if you are using the fan setting. Line a square tin with baking paper and grease with butter or spray with cake release.
• Add the flour, sugar and cocoa powder into a mixing bowl and use a fork to stir together. You can also sift the dry ingredients into your bowl. Make sure the mixture is a uniform brown colour without any lumps.
  
• Melt the butter or Stork (in a pan or use the microwave) and pour into the bowl. Stir using a fork then use your hands to rub the butter into the dry ingredients until you have a crumbly, wet sand texture.
  
• Tip the mixture into your prepared tin and spread out. Place your hand inside a sandwich bag and press down hard to flatten the mixture or use the back of a spoon. It needs to be packed down into an even layer.
  
• Bake for 20 minutes. Straight away mist the hot chocolate concrete cake with a little water (I use a spray bottle) and sprinkle with the sugar.
  
• I like to slice the crunch cake while it is still a little warm. I cut mine into triangle shapes but you can cut into squares or whatever you like. Cool on a wire rack and grab a slice as a sweet treat or serve with pink custard.
  
• Keep the chocolate crunch in an airtight container (a metal cake tin) for a few days – in my experience it magically disappears as soon as it is sliced!
  

Pink Custard just like School!

• Heat the milk until warm – don’t allow it to come to boiling point. Put the blackmange powder and sugar into a saucepan. Add a splash of warm milk and stir well to make a paste.
  
• Gradually add the rest of the milk, stirring well. Heat the pink custard mixture on the stove over the lowest heat setting, stirring constantly, until it starts to thicken.
  
• If your custard is still a little lumpy then pass it through a fine sieve. Serve immediately – if the custard starts to cool it will form a “skin”.

Video

Nutritional Info

Calories: 184kcal | Carbohydrates: 31g | Protein: 2g | Fat: 6g | Saturated Fat: 4g | Trans Fat: 1g | Cholesterol: 15mg | Sodium: 53mg | Potassium: 75mg | Fiber: 2g | Sugar: 18g | Vitamin A: 180IU | Calcium: 9mg | Iron: 1mg

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