The trick to special desserts is to go to the maitre d' 24 to 48 hours ahead of the day you want the dessert and make a special request for the number of desserts you want. You have to request special orders a day in advance, minimally. I have never, never been refused using this approach. You should ask as early as possible in the day. I have been told that I couldn't get my special if I ordered it too late in the day before or the day of wanting my request. The only thing that would prevent you from getting a special order should be lack of ingredients.