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1
Preheat oven to 350u00b0F.
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2
Thoroughly butter the bottom and sides of a 9x3-inch (12 cup) springform pan.
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3
Dust pan well with fine Zwieback crumbs, pressing any remaining crumbs into the bottom of the pan and about 1/2 to 1 inch up the sides; set aside.
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4
Sift flour and corn starch together into a small bowl or cup, and set aside.
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5
In a small bowl, beat eggs and sugar together until thick and sugar is dissolved, set side.
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6
Mix together ricotta and baker's cheese, place into a fine sieve and using a wooden spoon, force the cheeses through the sieve into a large bowl.
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7
With mixer on medium speed, beat cheeses for about 2 minutes or until creamy.
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8
Add cream cheese, and beat on low speed for about 1 minute, or until well blended.
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9
Add mascarpone, and beat by hand with a wooden spoon or spatula until well blended.
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10
Add melted butter, mixing by hand until well blended.
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11
Add egg/sugar mixture, mixing by hand until well blended.
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12
Add flour/corn starch mixture, stirring until thoroughly incorporated.
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13
Add lemon juice and vanilla, stir until well blended.
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14
Fold sour cream into cheesecake batter.
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15
Tap bowl of batter on counter several times to get any bubbles in the batter to the top.
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16
If necessary, run the spatula through the batter to break up any air bubbles.
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17
Slowly pour the batter into prepared pan, lightly tap pan on counter to remove any remaining bubbles.
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18
Place cheesecake on middle rack in oven and bake at 350u00b0F for 50 to 60 minutes.
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19
Turn off oven, and let cheesecake sit undisturbed (do not open oven door), 60 minutes longer.
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20
Remove from oven and continue to cool on wire rack.
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21
When completely cooled, cover and refrigerate for at least 2 hours before serving.
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22
When ready to serve, run a thin bladed knife or icing spatula between the cake and sides of pan to loosen cake from the sides.
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23
Remove the side of the springform pan, leaving the cake on the pan base/bottom to serve.
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24
(Optional) Cake may be topped with fresh fruit, pie filling or your favorite fruit glaze.