Blitz the digestive cookies in the food processor until fine. Pour melted butter over the biscuit crumbs and mix well. Texture should be like wet sand.
Pour out the biscuit crumbs into a 10x10 inch square cake ring on a cake board and spread evenly as a base (alternatively use a similar sized springform pan or pie dish) Use a small glass or a spoon to press it down especially around the sides, until the biscuit base is tight and nicely compact. Freeze for 30min.
Dissolve 1 1/2 tbsp of gelatine powder in 220ml of boiling water and set aside to cool. In a medium bowl, whisk the softened cream cheese and sugar until it’s well combined. Add half of the cooled liquid gelatine and mix well on low speed. Add 1 tbsp of vanilla essence and the remaining liquid gelatine and whisk on low until well mixed.
Switch to a spatula and mix by hand to remove air bubbles until the cream cheese mixture is nice and smooth.
Remove the biscuit base from the freezer and poke holes in it with a wooden skewer (this holds the cream cheese better). Layer in the cream cheese mixture evenly. If there are visible air bubbles, use the wooden skewer to gently pierce and smoothen out the bubble. Set in the freezer for no more than 7-8 minutes for the cream cheese to lightly set.
Remove the leaf and halve strawberries. Slit a V at the hull of each strawberry half. Gently but firmly press each berry half into the lightly set cream cheese to form neat strawberry rows (as a gauge, the strawberries should be at least 1/3 wedged into the cream cheese). Freeze for another 40 minutes.
To prepare the Jello mixture, dissolve the jelly crystals in 400ml boiling water. Stir briskly until the crystals are all dissolved, add 400ml cold water and mix well.
Retrieve the set cream cheese from the freezer and gently ladle the cooled liquid jello over the strawberries. (Be a gentle ladler otherwise you will get swimming strawberries!)
Set the Jello in the freezer for another 30 minutes and then chill in the fridge for at least 3 hours. When it’s time to serve, carefully remove the cake ring and enjoy the beautiful Strawberry Jelly Heart Cheesecake.