From "Cook's Country from America's Test Kitchen," episode 107, "Easy As Pie." For best results, use recipe #335191 (from the same episode). If it lasts, pie will hold in refrigerator 3-4 days, well-wrapped.
In a medium saucepan over medium heat, cook frozen raspberries until they begin to release their juices. Add pectin, sugar and salt. Bring to a boil and cook 2 minutes until slightly thickened. Remove from heat and strain. Press down on solids to extract as much liquid as possible; discard solids. Reserve 1/3 cup of jam and cool to room temperature. Fold fresh raspberries into remaining jam and pour into pie crust.
In the work bowl of a mixer, combine boiling water with raspberry-flavored gelatin. Stir until gelatin is fully dissolved. Add cream cheese and cooled raspberry jam. Beat with whisk attachment on high until cream cheese is fully incorporated (turn speed up slowly). Scrape down sides of bowl several times.
Add heavy cream. Start on medium-low until combined, then whip on high until thick but still pourable. Pour over jam in pie crust. Cover with plastic wrap and refrigerate until set, at least 3 hours. (Pie can be held in refrigerator at this point, up to 2 days.).
Whip very cold heavy cream with sugar until very thick. Fill piping bag with star tip with whipped cream. Pipe rosettes in circles to cover entire surface.