Preheat the oven to 350*. In a medium bowl, gently stir together the gooseberries ,brown sugar, flour. Let stand for 15 minutes. Press one of the pie crusts into a 9 inch pie plate.
In a medium bowl, stir together the lemon juice, and the sour cream, eggs and sherry. Add the gooseberry and sugar, nutmeg (divided) mixture, and stir to coat evenly. Spoon into the pie crust, and place the second crust over the top. Crimp the edges to seal, and cut some decorative slits in the top to vent steam. Sprinkle top with raw sugar, and nutmeg (divided)
Bake for 55 minutes in the preheated oven. Cool to room temperature, then refrigerate until serving.