Make the base: Crush the biscuits until they look like lumpy sand. (I do mine in a food processor because I'm lazy!) Whip your cream.
Mix with the melted butter and press into your 18cm (7") springform pan (US)/loose-bottomed tin (UK).
Melt the chocolate: Gently melt the 2 Terry's Chocolate Oranges in a glass bowl over a pan of boiling water. Stir until smooth and then put to one side and allow to cool for 5 minutes while you get on with the next step.
Whip the cream: Take the cream straight from the fridge (this helps to keep it stable) and whip enough so it holds its shape (to the texture of ice cream). Take care with it - too runny and it will be sloppy, too stiff and it will be too dense.
Create the filling: Combine the whipped double cream, cream cheese, icing sugar, lemon juice and orange essence (if using). Fold in gently until fully combined. Add the cooled melted Chocolate Oranges and stir thoroughly.
Assemble the cheesecake: Smooth on top of the biscuit base and flatten the top with the back of a spoon or a palette knife if you have one.
To set: Put into the freezer for 2 hours, fridge for 4 hours, or leave overnight if you are not in a rush.
Bring out of the fridge and remove from the tin, using the notes below.
Make the topping: Melt your white chocolate in a glass bowl over a pan of boiling water, colour the white chocolate with a tiny amount of gel colouring and allow to cool very slightly before drizzling over the cake in zigzags.
Pipe remaining whipped cream and decorate with Chocolate Orange segments. For clean slices, dip your knife in hot water and wipe dry between each cut.
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