Prepare the pan. Preheat an oven to 350°F 175°C. Grease a 9-inch round springform pan with butter, then dust with a little granulated sugar. Shake off any excess, then set aside.
Combine sugar and zest. Place ⅔ cup (130g) granulated sugar in the bowl of a stand mixer fitted with paddle attachment, then grate lemon zest directly on top. Use your fingers to rub the zest into the sugar.
Make the cheesecake batter. To the same bowl, add 2 cups (500g) ricotta, 1 Tbsp cornstarch, 1 tsp vanilla extract, and a pinch of Kosher salt. Mix on medium-low speed until smooth and creamy. Continue beating on medium-low, then add 2 eggs and 2 egg yolks one at a time, scraping down the sides after each addition, until very well incorporated. Be sure to scrape the bottom of the bowl with a spatula to ensure the ingredients are thoroughly mixed.
Prepare, then bake. Pour the ricotta cheesecake mixture into the prepared pan, then use a spatula to smooth into a flat, even layer. Place in a preheated oven and bake for 40-45 minutes. You’ll know the cheesecake is ready when it’s mostly set and only the very center jiggles a little bit.
Cool in the oven. Turn the oven off, then crack the door so it’s slightly ajar. Leave the cheesecake in the oven to cool slowly for 1 hour.
Chill overnight. Remove the cheesecake from the oven. Run a knife along the sides of the pan to make sure the cheesecake doesn’t stick, then allow it to cool completely on a wire rack at room temperature. Chill in a refrigerator uncovered for 6 hours or up to overnight. Cheesecake can be made 2-3 days in advance.
Slice, then serve. When ready to eat, allow the cheesecake to sit at room temperature for 20-30 minutes before removing from the pan and slicing. Serve with a dusting of powdered sugar and fresh or macerated fruit.