Preheat the oven to 325°F (163°C). Wrap the outside of a 9-inch (23 cm) springform pan securely with two layers of heavy-duty aluminum foil. Bring a large pot of water to a boil for the water bath.
Combine the graham cracker crumbs, finely chopped pecans, light brown sugar, and salt in a medium bowl. Stir in the melted butter until the mixture is evenly moistened.
1¾ cups (175 g) graham cracker crumbs, ½ cup (55 g) finely chopped pecans, 3 tbsps (38 g) light brown sugar, ½ tsp (3 g) kosher salt, ½ cup (113 g) unsalted butter
Press the mixture firmly into the bottom and slightly up the sides of the prepared springform pan. Bake for 10 minutes, then remove from the oven and allow the crust to cool. Reduce the oven temperature to 300°F (149°C).
Beat the room-temperature cream cheese in a large mixing bowl until completely smooth and free of lumps, about 2 minutes. Add the granulated sugar and light brown sugar, beating until combined.
32 oz (907 g) full-fat cream cheese , 1 cup (200 g) granulated sugar, ⅓ cup (71 g) packed light brown sugar
Mix in the sour cream, followed by the vanilla extract and flour. Add the eggs one at a time, mixing on low speed after each addition until incorporated. Avoid overmixing once the eggs are added, as excess air can cause the cheesecake to rise and crack during baking.
½ cup (120 g) full-fat sour cream , 2 tsps (10 ml) vanilla extract, 1 tbsp (8 g) all-purpose flour, 4 large eggs
Pour the cheesecake filling over the cooled crust and smooth the surface. Place the foil-wrapped springform pan inside a large roasting pan. Carefully pour boiling water into the roasting pan until it reaches approximately halfway up the sides of the springform pan.
Bake at 300°F (149°C) for 65–75 minutes, until the outer portion of the cheesecake is set but the center still has a slight jiggle when the pan is gently moved. The center should not appear liquid, but it should not be completely firm.
Turn off the oven, crack the oven door, and leave the cheesecake inside for 240 minutes to cool gradually. Remove the cheesecake from the water bath, allow it to finish cooling to room temperature if necessary, and refrigerate uncovered for at least 4 hours or overnight, until thoroughly chilled.
Melt the butter in a medium saucepan over medium heat. Add the dark brown sugar, Steen's cane syrup, and salt, whisking until the mixture is smooth and bubbling, approximately 4–15 minutes. Light corn syrup may be substituted for Steen's cane syrup, although the topping will have a milder flavor.
6 tbsps (85 g) unsalted butter, ¾ cup (160 g) packed dark brown sugar, ⅓ cup (80 ml) Steen's cane syrup , ½ tsp (3 g) kosher salt
Slowly whisk in the heavy cream until incorporated. Return the mixture to a gentle simmer and cook for 2 minutes, stirring to keep the sauce smooth.
½ cup (120 ml) heavy cream
Remove the saucepan from the stove and stir in the toasted pecan halves and vanilla extract until the pecans are evenly coated. Allow the topping to cool for 10–15 minutes, until slightly thickened but still soft enough to spoon over the cheesecake.
1½ cups (165 g) pecan halves, ½ tsp (2.5 ml) vanilla extract
Run a thin, sharp knife around the inside of the springform pan to release the chilled cheesecake, then carefully remove the outer ring. Spoon the pecan topping over the cheesecake, spreading it across the surface and allowing some to run down the sides.
Slice the cheesecake with a sharp knife warmed under hot water, wiping the blade between cuts. Serve chilled. The topping will become firmer after refrigeration while remaining sticky and chewy, similar to pecan pie filling.