Butter a 9” or 10” baking dish (3 to 4-quart dish) with 1 tablespoon of the butter and set aside.
Place the chopped dates and Elderberry Dark Balsamic Vinegar in a small bowl. Stir to separate the dates. Set aside.
Crack the eggs into an extra-large bowl, add the yolk, and lightly scramble with a fork or whisk. Set aside.
Place the whole milk, heavy cream, remaining 4 tablespoons butter, vanilla, zest, sugar, cinnamon, nutmeg, and sea salt in a medium saucepan over medium heat. Bring to a gentle simmer, lowering the heat if necessary to keep from boiling. Stir until the sugar has dissolved, the butter is melted, and the milk is hot, but not boiling.
Temper the eggs by slowly drizzling about ½ cup of the hot dairy mixture into the eggs while whisking the eggs with the other hand. Add another ½ cup of the hot liquid into the eggs while whisking again. Continue this process until you’ve mixed about half of the milk mixture into the eggs. Slowly pour the remaining hot mixture into eggs while whisking.
Add the balsamic-soaked dates and walnuts to the mixture and combine.
Add the bread cubes to the egg-date mixture and gently toss all the ingredients together. Pour into the greased baking dish.
Preheat the oven to 350 degrees F. Let it sit for 30 minutes before baking to allow the bread to soak the dairy and eggs. (There will be some standing liquid in the dish; that’s great!)
(See Notes for alternative baking instructions.) Cover the baking dish with foil and bake in the oven for 40 minutes. Remove the foil and bake for another 20 minutes or until a knife inserted in the middle comes out clean. The top should be nicely browned.
Remove from the oven. Serve with a sprinkling of confectioners’ sugar, vanilla ice, caramel sauce cream and/or sweetened whipped cream.
While the bread pudding is baking, make the caramel sauce. Place the sugar and water In a medium saucepan over medium-high heat. Allow the sugar to melt and bubble, stirring when necessary.
Keep an eye on the sugar as it darkens. When the caramel is turning a medium-dark amber color, remove the pan from the heat.
Add the heavy cream. Be careful; it will bubble up. Add the butter and vanilla and stir until the mixture is smooth. Use with the Bread Pudding, or pour into a bowl to cool. The caramel can be made up to 5 days in advance, kept in an airtight container in the refrigerator.
To make the whipped cream, add all the ingredients to a stand mixer bowl and attach the whisk attachment. Whip on medium-high until stiff peaks form. Best if used within 4 to 6 hours.