In a large bowl using a hand whisk beat eggs, egg yolks, brown sugar, cinnamon, and nutmeg. Pour in cream, milk, and vanilla extract and continue to mix until well combined.
In an even larger bowl mix butter, pecans, and ripped bread. Pour egg and milk mixture over top. Set aside and let the bread absorb the mixture for about 30 minutes.
Heat oven to 350 degrees and grease a 5 qt. dutch oven with butter. Pour bread pudding into the dutch oven and bake for 40 minutes or until the center is fully set.
In a medium saucepan, combine all of the sauce ingredients and bring to a boil, stirring constantly for 10 minutes, or until thick. Discard the vanilla pod. If extra cornstarch is needed to thicken, add in a heavy pinch at a time. Whisk until smooth and glossy.
Serve bread pudding with sauce over each individual serving, add more pecans and a pinch of flaked salt if so desired.