For The Pudding
Divide pound cake between the ramekins and then top with chopped cranberries.
Whisk together eggs and sugar. Add milk, vanilla, and salt and continue to whisk until thoroughly combined and perhaps even a bit frothy.
Pour the batter evenly over the bread cubes, pressing down the cubes if necessary to submerge in the liquid. Cover and refrigerate for at least an hour but up to twelve. Longer, in this case, is better.
Bake in a hot water bath at 350 degrees for about 25-30 minutes.
Allow to cool for about ten minutes before serving.
For the Rum Sauce
Combine juice, sugar, and whole cranberries in a small sauce pan. Bring to a low boil and allow to simmer for 3-5 minutes or until sugar is completely dissolved. Add the butter and return to a low boil for another 2-3 minutes. Add the rum and then simmer on low (swirling to stir) until sauce has reduced by about a quarter, approximately 15-20 minutes.
Drizzle (or pour if that’s more your thing) the warm, but not hot, sauce over the bread pudding just before serving.
This will probably be way more sauce than you need so if you decide to double the bread pudding recipe you do not need to double the sauce as well.