Chocolate Crema Catalana

Ingredients

• 1 tahitian vanilla bean, split lengthwise
• 2 cup water
• 2 cup granulated sugar
• 1 cup cold whole milk
• 3 1/2 teaspoon unflavored granulated gelatin
• 1 1/2 pound good-quality dark chocolate, such as valrhona or scharffen berger, grated
• 2 1/2 cup cold heavy cream
• 1 cup granulated sugar
• 18 large egg yolks, at room temperature
• 1/4 teaspoon kosher salt
• 5 cup mixed seasonal berries, such as strawberries, blackberries, and raspberries
• raw sugar (such as demerara, sanding, or raw cane sugar), for sprinkling
• lemon zest, for garnish