My mom loves lemon so I decided to make this special lemon curd cheesecake for her birthday. I had some mishaps when I tried to create a water bath to bake it in (water was leaking into my cake!!) and so I chose to forgo it. It worked well anyway and was well received! Here it is:
In a small bowl, combine graham cracker crumbs, sugar and salt. Using a fork, stir in butter until well combined. Press mixture into prepared pan. Bake 10 minutes. Cool on a wire rack while you prepare filling.
Remove saucepan from heat and strain mixture over a bowl. Stir in lemon zest and butter until butter completely melts. Cool slightly before using. Curd can be stored in refrigerator in an airtight container up to 1 week. Warm over a double boiler or microwave briefly to return it to liquid form. It will set up again when chilled.
Switch to a whisk attachment and continue by mixing in vanilla, lemon juice and lemon zest. Whip in eggs and yolk, one at a time, scraping bowl and whisk at least twice. Continue to whip on low speed and add sour cream. Whip until well blended; do not overbeat. Batter should be light and somewhat airy.
Brush sides of springform pan with melted butter and fill with cheesecake mixture. Transfer to oven and bake until filling is just set in center, about 45 minutes. Place on wire rack and cool to room temperature.
Stir lemon curd until smooth (it should be the consistency of thick sour cream) and spread over surface of cheesecake. Cover springform with plastic wrap and refrigerate 8 hours or overnight. To unmold cake, place a hot towel around pan to loosen cake from sides. Run a butter knife around edges and remove outer part of pan.