Ambrosia Watergate Salad with coconut is the classic green treat of a pistachio pudding salad (aka Watergate salad) mixed with an old-fashioned southern Ambrosia salad! Creamy pistachio pudding, fluffy whipped cream, crushed pineapple, tropical coconut, juicy mandarin oranges, sweet maraschino cherries, mini marshmallows, and crunchy pecans are mixed into a delightful dessert that's perfect to serve for any holiday or shindig.