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1
Grease the 7-inch springform pan liberally with butter and set aside.
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2
Using a food processor, blend cream cheese, sugar and flour for about 15 seconds.
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3
Add eggs, sour cream and vanilla blending until smooth (about 10 seconds more).
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4
Do not over mix the batter!
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5
Remove 1 cup of the batter and blend it into the melted chocolate.
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6
Pour all of the remaining batter into prepared pan.
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7
Using a tablespoon, gently drop dollops of the chocolate batter onto the top of the cheesecake (spaced evenly apart).
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8
Swirl the flat side of a knife through the batter in eight to ten figure-8's to create the swirls.
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9
Place the pan in the center of a long piece (about 2-feet) of heavy duty aluminum foil.
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10
Bring the two long ends up to meet, and fold over to seal them together, creating a small tent to allow a bit of space for the rising of the cheesecake.
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11
Bring the short ends of the foil together, pressing them tightly against the pan.
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12
Place a trivet or steaming rack on the bottom of the cooker.
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13
Place the cheesecake on top of the trivet.
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14
Pour in enough water to reach half way up the sides of the springform pan.
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15
Lock lid in place.
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16
Over high heat, bring to high pressure.
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17
Reduce heat just enough to maintain high pressure, and cook for 35 minutes.
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18
Turn off heat and allow pressure to drop naturally (about 15 minutes).
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19
Tilting pan away from you, unlock and remove lid, allowing steam to escape.
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20
Let cheesecake cool for a few minutes before removing it from the pressure cooker.
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21
Set pan on a cooling rack, remove foil and allow cheesecake to cool to room temperature.
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22
If there is a tiny puddle of water on the middle of the cake, gently blot it up with a paper towel.
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23
Cover and refrigerate at least 6 hours or overnight.
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24
Before serving, bring the cheesecake to room temperature, remove sides of pan (leave pan base in place, and set on serving platter).
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25
Arrange berries on top and around sides of cake, slice and serve.
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26
NOTE: For Lemon Cheesecake, omit the vanilla extract and the chocolate from the recipe, do not set aside 1 cup of batter.
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27
Add 1 Tablespoon of freshly grated lemon zest to all of the batter, blending well, and proceed with baking instructions.