Spiced Bundt Cake With Apple Caramel Sauce

Ingredients

• 1 cup sugar
• pinch of cream of tartar
• 1/4 cup fresh apple cider
• 1/4 cup heavy cream
• 1 tablespoon apple cider vinegar
• 1 teaspoon vanilla extract
• 1/4 teaspoon kosher salt
• nonstick vegetable oil spray
• 1 1/4 cups (2 1/2 sticks) unsalted butter
• 1 vanilla bean, split lengthwise
• 2 1/3 cups all-purpose flour
• 1 1/4 cups slivered almonds
• 2 teaspoons baking powder
• 2 teaspoons kosher salt
• 1 1/2 teaspoons freshly grated nutmeg
• 1 1/2 teaspoons ground cinnamon
• 1 teaspoon ground allspice
• 3/4 teaspoon ground ginger
• 1/2 teaspoon freshly ground black pepper
• 1/2 teaspoon ground cloves
• 1 cup (packed) dark brown sugar
• 1 cup sugar
• 3/4 cup powdered sugar plus more
• 1 teaspoon finely grated lemon zest
• 3 large eggs
• 5 large egg yolks
• 1 cup whole milk