Frozen Date Delight suggests that the pineapple/ cream cheese/ pecan/ date/ whipped cream confection only counts as dessert if it's fortified with a couple tablespoons of sugar. Leave them out, and this sweet and creamy mixture is clearly a salad.
The rule was further bolstered by a recipe from Two Hundred Tasty Treats (Christian Women's Fellowship, Southside Christian Church, Muncie, IN, ca. 1960). Here, the divide is not quite the same (vegetable or dessert?), but the conclusion is similar.
The mixture of sweet potatoes, bananas, milk, sugar, egg yolks, and raisins "is considered a vegetable instead of a dessert, but may be served as a dessert if you like. Add more sugar if using for dessert." It doesn't specify the amount of added sugar to make this a dessert, but based on the preceding recipe, I'll say two tablespoons. That will leave us with a nice, neat rule. If it's pretty sweet, it's not actually dessert unless you add an extra two tablespoons of sugar. Easy!