Prepare the crust:
- Preheat oven to 325°F (160°C). Grease a 9-inch springform pan.
- In a medium bowl, combine graham cracker crumbs, sugar, and melted butter.
- Press mixture into the bottom of the prepared pan. Bake for 10 minutes. Set aside to cool.
2. Make the cheesecake filling:
- In a large bowl, beat cream cheese and sugar until smooth.
- Add eggs one at a time, mixing well after each addition.
- Mix in sour cream, flour, lemon juice, and lemon zest.
3. Make the raspberry sauce:
- In a small saucepan, combine raspberries, sugar, cornstarch, and water.
- Cook over medium heat, stirring, until the mixture thickens (about 5 minutes). Remove from heat and strain to remove seeds, if desired.
4. Assemble the cheesecake:
- Pour half of the cheesecake batter over the crust. Drizzle with half the raspberry sauce. Repeat with remaining batter and sauce. Swirl gently with a knife for a marbled effect.
- Bake for 50–60 minutes, or until the center is slightly jiggly but mostly set. Cool to room temperature, then refrigerate for at least 4 hours or overnight.
5. Prepare the meringue topping:
- In a clean bowl, beat egg whites with cream of tartar until soft peaks form. Gradually add sugar and beat until stiff peaks form.
- Spread meringue evenly over the chilled cheesecake.
6. Toast the meringue:
- Use a kitchen torch to gently toast the meringue until golden brown. Alternatively, place the cheesecake under a broiler for 1–2 minutes, watching closely.
7. Serve:
Slice and serve chilled. Enjoy!