Step 1
Grease a 16 x 26cm slice pan and line with baking paper, allowing the paper to extend up all sides.
Step 2
Break up the biscuits into a food processor and process until coarsely crushed. Add the butter and process until combined. Transfer to the prepared pan. Use a flat-bottomed glass to press the biscuit mixture into the base and up sides. Place in the fridge for 20 minutes or until firm.
Step 3
Place water in a small microwave-safe bowl and sprinkle with the gelatine. Set aside for 2-3 minutes to soften. Microwave on High for 10 seconds or until hot. Use a fork to gently whisk until gelatine dissolves. Set aside to cool slightly.
Step 4
