Nut Picnic Tarts

INGREDIENTS

• All-purpose flour, for work surface
• Sweet Pastry Dough
• 3/4 cup (3 ounces) hulled pumpkin seeds
• 3/4 cup whole unblanched almonds (3 ounces)
• 3/4 cup whole unsalted macadamia nuts (3 ounces)
• 3/4 cup blanched hazelnuts (3 ounces)
• 1 cup plus 2 tablespoons heavy cream
• 1/4 teaspoon coarse salt
• 3/4 cup (1 1/2 sticks) unsalted butter
• 1 vanilla bean
• 1 cup plus 2 tablespoons water
• 1 1/2 cups granulated sugar
• 3 tablespoons light corn syrup