METHOD
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lemon curd
Add sugar and freshly grated lemon zest to a bowl. Using your fingertips, rub the sugar and lemon between your fingers to combine the ingredients and for the lemon to release its delicious flavors. Add the lemon paste and egg yolks. Using a whisk, mix everything. Pour the lemon juice, stir with a whisk, and transfer to a deep pan. Cook over low heat until the mixture reaches 80 °C / 175 °F. Remove from the heat and strain through a fine sieve. While the mixture is still warm, stir in the butter until it melts and combines. Set aside until needed.
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graham cracker base
Add the graham cracker crumbs, sugar, and melted butter to a bowl. Using a spatula, stir to combine. Line a 20 cm x 20 cm (8-inch x 8-inch) baking dish with parchment paper. Add the graham cracker mixture and spread it evenly over the dish's bottom. Press the mixture using a glass to arrange it evenly and achieve an even base thickness. Place in the preheated oven on the middle rack. Bake for 10 - 12 minutes at 180 °C /350 °F or until golden brown. Remove from the oven and set aside for 15 minutes.
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cheesecake mixture
Add the cream cheese, sour cream, lemon juice, vanilla, and sugar to a bowl. Using an electric mixer, beat into a smooth mixture. Mix for about 2 - 3 minutes. Add the eggs and quickly mix to incorporate for about 30 seconds. Pour the mixture over the slightly chilled graham cracker base.
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Lemon Cheesecake Bars
Spoon dollops of the lemon curd over the filling and use a teaspoon handle or a butter knife to carefully swirl it into the batter. Avoid cutting into the crust. Place in the preheated oven on the middle rack and bake for 40 minutes at 150 °C / 300 °F or until slightly jiggly in the center and set on the edges. Set aside for one hour, then transfer to the fridge for 4 hours or overnight for the best flavor and texture. Cut into 12 large pieces.