Having been there twice, I don't recall
any particular special "principality" dessert - just your typical French ones.
Luisa, What do you mean by "thing"???
I had the most delicious peach melba in Nice that I'll never forget. It was huge and served in a beautiful green parfait dish.
Here's a dessert menu of Louis XV'S restaurant in Monte Carlo to give you some ideas:
( SEASONAL FRUITS )
• Peaches in olive oil/lemon vinaigrette, sorbet and nectarine Tatin. 26 €
• Local “fraises des bois” in their natural juice, Mascarpone sorbet. 26 €
• Apricot shortbread, vanilla flavor, pistachio ice cream, raspberry and apricot sorbet. 26 €
( CHOCOLATE, MILK )
• Milk ice cream and “fleur de sel”, croquant/caramel with curdled ewe milk. 26 €
• Louis XV with a crispy praline. 26 €
• Rich chocolate granita, Arabica cappuccino coffee with chicory. 26 €
( TRADITIONAL FARE )
• Rum baba, served with your choice of rum, whipped cream. 26 €
• Peach Melba. 26 €
( ICE CREAMS )
• Selection of home-made ice creams and sorbets. 14 €
Pastry Chef: Olivier Berger
Taxes and service (15%) included