01 - Preheat oven to 325°F. Grease a 9-inch springform pan and line the bottom with parchment paper.
02 - In a medium bowl, combine graham cracker crumbs, melted butter, and sugar until evenly moistened. Press the mixture firmly into the bottom of the prepared pan. Bake for 10 minutes, then set aside to cool slightly.
03 - In a large bowl, beat cream cheese with an electric mixer until completely smooth. Add sugar and beat until light and creamy. Add eggs one at a time, mixing thoroughly after each addition. Blend in vanilla extract, sour cream, flour, and lime zest until just combined — do not overmix.
04 - Pour the filling over the cooled crust and smooth the top with a spatula. Bake for 50 to 60 minutes, until the center is just set with a slight jiggle remaining. Turn off the oven, crack the door open, and let the cheesecake cool inside for 1 hour.
05 - Remove from the oven and refrigerate for at least 4 hours, preferably overnight, before adding the topping.
06 - In a small saucepan over low heat, combine guava paste, water, and lime juice. Stir constantly until the paste melts into a smooth, glossy sauce. Remove from heat and let cool slightly.
07 - Pour or spread the guava topping evenly over the chilled cheesecake. Refrigerate for another 30 minutes to allow the topping to set.
08 - Run a thin knife around the edge of the cheesecake before releasing the springform pan ring. Slice into portions and serve chilled.