Combine eggs, brown sugar, 1 tsp of pure vanilla extract, flour, salt, and butter in a medium-sized saucepan.  Bring to a boil over medium heat and stir constantly.  Cook sugar until dissolved (about 5 minutes).  The mixture will be very hot, so carefully taste.  Remove from heat.  Stir in rum and 2 tsp of pure vanilla extract.  Cool in fridge.  Reheat before serving if too thick or cold.

Combine eggs, brown sugar, 1 tsp of pure vanilla extract, flour, salt, and butter in a medium-sized saucepan.  Bring to a boil over medium heat and stir constantly.  Cook sugar until dissolved (about 5 minutes).  The mixture will be very hot, so carefully taste.  Remove from heat.  Stir in rum and 2 tsp of pure vanilla extract.  Cool in fridge.  Reheat before serving if too thick or cold.