Dessert and no sugar is a contradiction in terms. Desserts are defined by being sweet. The sweetness may come from sugar, from honey (which is, in fact, sugar), from fruits (which have not enough sugar, so sugar is added) or from artificial sweeteners (I don’t think you mean this).
Take Rote Grütze. It is cooked of red berries, juice, starch (as a thickening agent) and sugar. And since it is not sweet enough it is served with vanilla custard or sweetened cream.
Or Bratapfel. It is a baked apple which is sweetened with a stuffing of marzipan. And served, guess how, with vanilla custard or ice cream.
I do not know what your question aims at.
Are you looking for a healthy dessert with low sugar? Then eat just berries - strawberries, blueberries, blackberries, red or black currant. They are low in sugar. You may add unsweetened yoghurt, Quark (cream cheese) or cream.
Quark with puréed strawberries and strawberry chunks
Blueberry yoghurt
Or eat desserts with artificial sweeteners. Although they are even worse in causing diabetes than sugar.
