Heat the oven to 400 degrees.
Line a nine-inch pie plate with the pastry. By all means build a rim with the pastry and flute it. This is essential for the amount of custard indicated in this recipe.
Cover the bottom of the pastry with a round of parchment paper and add enough dried beans or peas to partly fill the shell. Bake 10 minutes.
Reduce the oven heat to 375 degrees. Remove and discard the beans and parchment paper and set the pastry-lined pie plate aside.
Combine the eggs, cream, nutmeg, salt, pepper and Tabasco sauce. Sprinkle the ham, onion and cheese over the inside of the partly baked pastry.
Pour the cream mixture over the onion-cheese-ham mixture. Sprinkle the other 1/2 cup of cheese over the top. Slide the pie onto a baking sheet(?-other recipe didn't use the baking sheet).
Bake the pie until a knife inserted one inch from the pastry edge comes out clean, about 40 minutes. Remove to a wire rack. Let stand 5 or 10 minutes before serving.