Kitty Hope and Mark Greenwood make cinder toffee on Sweets Made Simple with just a few simple ingredients.

The duo says: “Whether it’s ‘cinder toffee’, ‘honeycomb’, ‘puff candy’ or ‘sea foam’, whatever you call it, this toffee is by far the most dramatic to make. Take care as it bubbles up like a volcano to the top of your pan while being heated.”

The ingredients are: vegetable oil, for greasing, 75g granulated sugar, 100g liquid glucose, 25g of golden syrup and 15g bicarbonate of soda.