For caramel
In a heavy bottom saucepan heat one cup of sugar until melted, 5-10 minutes. Stir consistently with a wooden spoon and be VERY careful not to burn. The color should be amber brown. Any darker and you have burned your sugar. Add in butter slowly and stir until melted.
Very slowly add in heavy whipping cream.
Continue to boil and stir for another 30 seconds to 1 minute. Remove pan from heat add in salt and vanilla beans from pod. Transfer caramel to a glass jar to cool completely and thicken.
For apple bundt cake
Preheat oven to 350 F. Grease 10-Cup Bundt pan well with unsalted butter and set aside. Fill a separate 8-inch cake tin with ¾ cup of water and place on the bottom rack of oven. The steam will ensure a moist Bundt cake.
In an extra large bowl toss together bread cubes and shredded apple. In a separate bowl whisk together eggs, egg yolks, cream, milk, honey, caramel, vanilla extract, salt and spices until smooth. Pour egg mixture over bread cubes and stir mixture to coat evenly. Let mixture soak for 15 minutes.
Press the soaked bread mixture into greased bundt pan in 3 increments. Press each layer down into the bundt pan. Place bundt pan in the middle of the oven above water filled cake tin. Bake cake for 50-55 minutes or until top is golden brown.
Remove the cake tin with water. Turn the oven off and open the door to vent. Keep Bundt pan in the oven until cake has cooled completely. Flip the cake onto a serving platter and drizzle with remaining vanilla bean caramel.