Whisk together egg yolks, brown sugar, and honey in a heavy sauce pan. Add the cream and pumpkin and mix until well combined. Mix the spices and salt in a small bowl and add to the pumpkin mixture. Mix until well combined. Cook over medium heat, stirring constantly. Cook until the mixture reaches 160-degrees F (mixture should coat the back of a spoon). Remove from heat. Add the vanilla extract and paste (and Bourbon if you wish). Mix well.