In a medium saucepan, split vanilla bean, scrape the insides and put both seeds and pod into the pan, pour milk over. Simmering the mixture over medium-low heat for 15 minutes, do not let this to a boil. Remove from stove and cover.

In a mixing bowl, whisk eggs, and yolks together, gradually add in sugar and salt. Whisk in sifted flour and set aside.

Strain the vanilla pod from the milk and reheat to a lukewarm, stir in melted butter.

Gradually pour warm milk mixture into the egg mixture while stirring with a whisk. Strain the mixture and cool down completely before rest the mixture at least 12 hours in a fridge. (If 24-48 hours preferred, stir the mixture every 24 hours.)

Baking; Preheat the oven 425F (210C). Take the pre-rest mixture out from the fridge, stir in rum and let it sit at a room temperature. Butter the mold using a pastry brush with white oil (a mixture of bee wax and butter) or grease with a cooking spray is optional. Fill up the molds with the mixture to a 1/4" from the top.

Put filled molds on a sheet pan and put in the oven. Bake for 15 minutes, decrease temperature to 375F (185C) and bake for another 45-60 minutes to a dark brown color. When done, take out from the oven and unmold immediately on a wiring rack let them cool down completely or enjoy while they are still a little warm is a pleasure. If any of the pastry pop or float to the top of the mold, try to take it out from the oven and knock or squeeze the pastry back into the mold for a better result.