Preheat the oven to 300°F (150°C).
For the crème brûlées: In a small saucepan, bring pomegranate juice to a boil over medium-high heat; boil until reduced to ¼ cup (60 ml), 10 to 15 minutes. Reduce heat to low. Add cream, whisking slowly and constantly. Cook, whisking slowly and constantly, until cream is warmed through, 1 to 2 minutes. Remove from heat.
In a medium bowl, whisk together egg yolks and ⅓ cup (67 grams) granulated sugar until sugar dissolves and mixture is a pale yellow, 2 to 3 minutes. Slowly add pomegranate mixture, ½ cup at a time, whisking constantly to ensure the eggs do not cook.
Place 6 (6-ounce/175 ml) ramekins on a baking pan. Spoon ½ cup (120 ml) custard into each ramekin. Place pan in oven. Pour boiling water into baking pan until water covers the bottom one-fourth of ramekins.
Bake until edges are set but centers are still jiggly and an instant-read thermometer inserted in center registers 175°F (80°C), 40 to 45 minutes*. Carefully, transfer ramekins to a wire rack, and let cool for 1 hour. Refrigerate for at least 4 hours, ideally overnight, to set.
Just before serving, sprinkle remaining 6 teaspoons granulated sugar on top of custards. Using a handheld kitchen torch, carefully brown the sugar.
For the whipped cream: In a large bowl, beat cold cream and confectioners’ sugar with a hand mixer on medium speed until medium peaks form. Dollop cream on top of each crème brûlée. Garnish with pomegranate arils, if desired.
*If it is still liquid-y, continue baking for 5 to 10 minutes more.