Make your own cinder toffee

Make your own cinder toffee

Sweet science

Cinder toffee is really tasty. Did you know there's science behind the sugar? Make your own and find out what's going on!

What you need:

  • 100g caster sugar
  • 3 tablespoons golden syrup
  • 1 teaspoon bicarbonate of soda
  • Butter or margarine
  • Large heavy-bottomed saucepan
  • Wooden spoon
  • Foil
  • Roasting tin
  • Cook's thermometer (optional)

How to:

Ask an adult for help making the cinder toffee. Sugar gets very hot and can burn.

  1. Line the roasting tin with foil. Grease the foil with butter or margarine.
  2. Mix the caster sugar and golden syrup in the saucepan.
  3. Place on the stove on a low heat until the sugar has melted. This should take 10-15 minutes. Stir occasionally and don't let the sugar burn. If you have a cook's thermometer, you can heat the mixture until it reaches around 150 Celsius and keep it at that temperature for 10 minutes.
  4. Once the sugar has melted, take the pan off the heat and mix in the bicarbonate of soda. Be careful, the sugar will bubble up!
  5. Pour the mixture into the tin and leave the toffee to cool.

Break the toffee into bits and taste!

What's happening?

The heat of the sugar mixture causes the bicarbonate of soda to break down and release carbon dioxide bubbles.

The carbon dioxide bubbles make the sugar mixture expand. When the sugar mixture cools, gaps remain where the carbon dioxide bubbled through the mixture. This gives cinder toffee its distinctive texture.

Main image (c) grongar

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