01 - Preheat the oven to 325°F (165°C). Grease a 9-inch springform pan and line the bottom with parchment paper.
02 - In a medium bowl, combine the graham cracker crumbs, melted butter, and 2 tablespoons 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 the cream cheese with an electric mixer until completely smooth. Add the sugar and continue beating until light and creamy. Add the eggs one at a time, mixing thoroughly after each addition. Blend in the 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, or 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 - Transfer the cheesecake to the refrigerator and chill for at least 4 hours, or ideally overnight, before adding the topping.
06 - In a small saucepan over low heat, combine the chopped guava paste, water, and fresh lime juice. Stir continuously until the paste melts into a smooth, glossy sauce. Remove from heat and let it cool slightly.
07 - Pour or spread the warm guava topping evenly over the chilled cheesecake. Return to the refrigerator 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.