clock clock icon cutlery cutlery icon flag flag icon folder folder icon instagram instagram icon pinterest pinterest icon print print icon squares squares icon
Pink custard being poured onto a chocolate cake

Chocolate Concrete

  • Author: Michelle Minnaar
  • Prep Time: 5 minutes
  • Cook Time: 35 minutes
  • Total Time: 40 minutes
  • Yield: 20 squares 1x
  • Diet: Vegetarian


Chocolate concrete cake, also known as chocolate crunch, is a retro school dinner loved by all who went to school during the 1980s. Best served with pink custard.



  • 600g (4¾ cups) flour
  • 600g (3 cups) sugar
  • 160g (2 cups) cocoa powder
  • 300g (1⅓ cup) butter, melted


  1. Preheat the oven to 180°C / fan 160°C / 356°F / gas mark 4.
  2. Butter a 30x22cm (12 x 8.5in) tin and set aside.
  3. Place the flour, sugar and cocoa powder in a large mixing bowl and give it a good stir.
  4. Drizzle the melted butter into the flour mixture.
  5. Mix everything together until the mixture is crumbly and sand-like.
  6. Tip the bowl’s contents into the buttered tin.
  7. Using your hands or a spatula, press hard onto the chocolate mixture. Flatten the surface as much as
  8. possible and ensure that the mixture is as dense as possible.
  9. Bake in the oven for 30-35 minutes, or until crisp.
  10. Remove the tin from the oven and sprinkle with extra sugar.
  11. You can serve it either hot or cold, on its own or with pink custard. Enjoy!


  • If you’re vegan, you don’t have to miss out. Simply substitute the butter with a vegan butter.
  • I’ve intentionally made this concrete cake thicker than the original. The thinner versions just break so much easier.
  • Category: Dessert
  • Method: Bake
  • Cuisine: British

Keywords: chocolate concrete, concrete cake, retro school dinner dessert, 80s dessert recipe, chocolate crunch