Mix the graham cracker crumbs and melted butter together. Press the mixture into the bottom of a 9-inch springform pan to form the crust.
In a large bowl, beat the cream cheese and 1 cup of sugar until smooth. Add in the eggs, one at a time, beating after each addition.
Stir in the sour cream, vanilla extract, lemon juice, and lemon zest until well combined. Pour the cheesecake batter over the prepared crust.
Bake for 50-60 minutes until the center is set. Let cool at room temperature, then chill in the refrigerator for at least 4 hours.
For the meringue, beat the egg whites with cream of tartar and salt until soft peaks form. Gradually add the remaining 1/4 cup of sugar and beat until stiff peaks form.
Spread the meringue over the chilled cheesecake. Use a kitchen torch to lightly brown the meringue or bake at 400°F (200°C) for 5-6 minutes until golden.
Notes
Ensure all ingredients are at room temperature for the best texture.