For Pie Crust:
Stir together the crumbs, the sugar, and the melted butter. Press into an even crust in a 9-inch springform pan, covering the bottom of the pan.
For the Cheesecake:
Preheat the oven to 350°F.
Purée the ricotta with the sugar in a food processor until smooth, 3-5 minutes.
In a stand mixer fitted with the paddle attachment, mix the cream cheese with the ricotta mixture on medium speed until smooth, about 10 minutes, scraping down the bowl with a rubber spatula as needed. Add the eggs and mix on low speed, scraping down the bowl thoroughly after each addition, until very smooth. Add the vanilla extract, lemon juice, cornstarch, and flour to the batter and blend on medium speed until smooth. Gradually add the melted butter, scraping down the bowl as needed, until evenly blended.
Spread the batter in an even layer over the crust in the prepared pan. Gently tap the pan on the counter a few times to release any air bubbles. Place the pan in a shallow baking dish and place the dish on the oven rack. Add about 1 inch of hot water. Bake until the center is set, the sides of the cake start to pull away from the sides, and the top is just starting to brown, 50-60 minutes.
Cool the cheesecake in the pan on a wire rack, and then refrigerate for at least 3 hours and up to overnight before unmolding. To unmold, unlatch the clamp to open the sides and lift the form away from the cake.
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