Step 1
Pour the creaming soda into a small saucepan over medium-high heat. Bring to a simmer. Place the boiling water in a small heatproof bowl and sprinkle with the gelatine. Stir until dissolved then stir into the creaming soda mixture. Pour the mixture into a small plastic container and place in the fridge for 4 hours or overnight to set.
Step 2
Grease the base and side of a 20cm (base size) round springform pan. Line base and side with baking paper. Place the biscuits in a food processor and process until finely crushed. Add the butter and process until combined. Transfer the mixture to the prepared pan and use a straight-sided glass to press firmly over base and up side of pan. Place in the fridge for 30 minutes to chill.
Step 3
Place the cream cheese and condensed milk in a clean food processor. Process until smooth. Add food colouring to tint pink. Process until evenly coloured. Place the extra boiling water in a heatproof bowl. Sprinkle with extra gelatine. Stir until dissolved. Add to the cream cheese mixture. Process until well combined.