- Melt the unsalted butter in a saucepan over low heat.
Grind the butter tea biscuits in a food processor. Add the melted butter and mix well.
- Line a springform pan with parchment paper. Press the cookie mixture evenly into the bottom using the back of a spoon. Place in the fridge to firm up.
- In a large bowl, combine cream cheese, crème fraîche, lemon zest, lemon juice, sugar, and cornstarch. Mix until smooth. Put the mixer aside and switch to a spatula. Add eggs one by one, folding gently after each.
- Pour half of the cheesecake mixture over the cookie crust and spread evenly.
- Pipe a swirl of lemon curd over the batter. Pour the remaining cheesecake batter on top and spread evenly.
- Bake in a preheated oven at 125°C (257°F) for 60–65 minutes, or until the edges are firm and the center still jiggles slightly. Turn off the oven and let the cheesecake sit inside for 1 hour to prevent sinking or cracking.
- Heat the heavy cream until nearly boiling. Add chopped white chocolate, let sit for 1 minute, then stir into a smooth ganache.
- Spread the ganache evenly over the cheesecake. Pipe some lemon curd on top and use a toothpick to create a decorative swirl. Cover and refrigerate, preferably overnight.
- Slice into even pieces. Garnish with whipped cream, lemon slices, and mint leaves if desired.