In a medium sized, heavy bottomed saucepan combine the milk, cream, salt, sugar, tapioca, and beaten egg. Let sit for about 5-10 minutes. Place the saucepan over medium heat and, stirring slowly but constantly, bring to a full boil (this will take about 10-15 minutes). Remove from heat and stir in the vanilla extract. Let the pudding cool, untouched, in the saucepan for about 20 minutes. Garnish with pistachio.
