I first used this recipe as an entree for two on Valentines Day. It was given to me by a family friend. You can also use a pack of 6 or 12 mini vol-au-vents as appetizers. Since then I have made them again and I didn't have tarragon so I used sage. So I think you can put your favourite spice instead of the tarragon as the sage worked well. I didn't have cream so I used cream cheese. I had a question regarding vol-au-vent cases and after researching on many web pages and even posting a question in the forum. I found out that vol-au-vent cases are the same thing as puff pastry shells. So if you are using puff pastry shells please follow the instructions on the pack. As in Australia the vol-au-vent cases come on the shelf (pre-cooked, ready to use) not the freezer.