Method

Crush the digestive biscuits till it is fine and sandy.

Add the melted butter. Mix well.

Pour into baking tin/tin with removable base/cake ring and compact with the back of a spoon/ladle/flat cup.

Once compact, pop it into the freezer for 30 minutes while the cream cheese mixture is being prepared.

To the water, add the gelatin and stir well to combine. Pop it into the microwave oven and warm it up on medium heat for 2 minutes. Alternatively, you may double boil it till the gelatin is all dissolved. 

To the sugar, add the softened room temperature cream cheese. 

Mix well on low speed till creamy.

Stir the gelatin mixture and allow it to cool completely. 

Pour gelatin mixture into cream cheese and mix on slow speed till well combined.

Add in the yoghurt. Mix on low speed till well combined. 

You should get something like this. Avoid mixing on high speed as it'd incorporate many bubbles into the mixture. That's something we wouldn't want. 

Weigh and portion out the batter into 6 bowls. 

Add in the food colouring and mix well. Generally, I dipped a toothpick into the colour pot and dipped it into my mixture. If it is not to my liking, I added more of the food colouring. Do use bowls with spouts as I find that it gives one better control of the mixture that gets poured in. 

Remove base from freezer. Pour in the first layer of cream cheese mixture. Allow it to spread out gently.