Pretty and Festive White Chocolate Pomegranate Cheesecake

Name: Pretty and Festive White Chocolate Pomegranate Cheesecake
Prep time: 50 min
Total time: 50 min
Cuisine: American
Ingredients: 1 1/2 cups (about 7 oz.) finely crushed gingersnap cookies; 6 Tbsp. unsalted butter, melted, divided, plus more for greasing pan; 3/4 cup plus 2 1/2 Tbsp. granulated sugar, divided; 1 tsp. kosher salt, divided; 3 8-oz. pkg. cream cheese, at room temperature; 3 large eggs, at room temperature; 2/3 cup sour cream; 7 oz. white chocolate, melted and cooled to room temperature, plus more, unmelted, for topping (optional); 1 Tbsp. plus 2 tsp. cornstarch, divided; 1 1/2 cups pomegranate juice; 2 tsp. lime zest plus 1/2 tsp. fresh juice (from 1 lime); 1/4 cup pomegranate arils2 Tbsp. roasted, salted pistachios, roughly chopped