Make the hard candy glass

• Combine the sugar, water and corn syrup in a saucepan and mix well before heating.
• Bring to a boil without stirring and cook until it reaches 300 °C (hard crack stage).
• Pour the syrup onto a heat-safe tray and spread it out as thinly as possible.
• Let it cool completely until hard, then break into shards.

Make the edible blood

• Whisk the corn syrup with the cocoa powder until smooth and thick.
• Stir in the red food coloring until the mixture is a bright, convincing red.
• Adjust the color and thickness as needed.

Clean up

• Fill the pan with water and let it boil to dissolve the hardened sugar.
• Do not pour the candy mixture down the sink.