This is very rich and very decadent. For special occasions or romantic picnics. Emmenthaler cheese can be substituted for Gruyere, or use a combination of both. It is possible to use sour cream in place of whipping cream. It should not be necessary to season the filling with salt because the smoked fish is already quite salty, but do so, sparingly, if desired. Time does not include chilling the pastry. If you are concerned about calories and/or cholesterol, try substituting low fat evaporated milk for the cream - it will not taste the same, but it might make you feel less guilty! You could even use Julesong's Oil Crust Pie Shell #202023. I've not tried it myself, but it has good reviews. Moi? I think I'll stick with the original :-)