Mix the cornflour with 1 tbsp cherry juice, then tip the mixture into a small pan with the glucose syrup and remaining cherry juice. Heat gently over a low heat, whisking well to combine, then remove from the heat.

Squeeze in a generous amount of the red food colouring gel and stir well, then add a very small drop each of the blue and yellow food colouring gels and stir again. You are aiming for a deep red-brown blood colour. Continue adding little drops of food colouring, stirring well between each addition, until you reach your desired colour. The edible fake blood will keep in a sealed jar in the fridge for up to three weeks. This recipe makes a thick, slow-running gel. If you want a thinner gel, simply stir in a little more cherry juice or water.