Refrigerate for 4 hours. Stir pineapple-flavored gelatin with boiling water in a bowl until dissolved; stir in cold water. https://www.yummly.com/recipes/pineapple-coconut-cake-with-cake-mix Bring to a boil; cook and stir over medium heat until thickened, about 5 minutes. Poke holes into cake using a skewer or straw; spoon gelatin mixture evenly over cake. Combine Cool Whip (or whipped cream) with shredded coconut and spread evenly over the top of the pineapple. Remove from heat and stir in vanilla, salt, pecans, and coconut. Poke holes in the hot cake with the top of a wooden spoon. While cake is baking, prepare frosting: Combine butter, sugar, and evaporated milk in a saucepan. Cover and refrigerate until ready to serve. Spread the frosting evenly over the hot cake. Drain crushed pineapple and spread evenly over the top of the cake. Mix pineapple and pudding mix in a bowl; fold in whipped …