To make vanilla pudding, combine cornstarch, sugar, and salt in a saucepan off the heat. Add milk gradually, stirring constantly, until well blended. Heat over medium heat, stirring, until mixture is thick and begins boiling. Remove from heat. Quickly stir in vanilla and butter. Chill for 2 hours. To assemble: Cover the bottom of a medium serving bowl (or of individual dessert bowls) with vanilla pudding. Add a layer of bananas, then a layer of rice. Alternate layers. Finish with a layer of pudding. Whip coconut cream (see “How to Make Whipped Coconut Cream”) and top with a thick layer. Add sliced bananas or any fruit on hand. For an easier alternative: Use boxed vanilla pudding mix. Don’t whip coconut cream; drain as directed in sidebar, stir, and spread thick coconut cream over top.