Spiced Caramel Corn

INGREDIENTS

• 4 ounces whole macadamia nuts (about 1 cup), optional
• 1/2 teaspoon vegetable oil
• 1/3 cup unpopped popcorn
• 1/4 cup water
• 2 cups sugar
• 2 tablespoons light corn syrup
• 1 vanilla bean, split lengthwise and scraped
• 3/4 teaspoon ground cinnamon
• 1 1/2 teaspoons freshly grated nutmeg
• 1/8 teaspoon ground cloves
• 1/4 teaspoon ground cardamom
• 1 1/2 teaspoons coarse salt