Quiche Lorraine Gelson's

Ingredients

• Pastry dough for a one-crust, nine-inch pie
• 4 strips bacon
• 1 onion, thinly sliced
• 1 cup Gruyère, cubed
• ¼ cup Parmesan, grated
• 4 eggs, lightly beaten
• 2 cups heavy cream, or 1 cup each milk and cream
• ¼ tsp nutmeg
• ½ tsp salt
• ¼ tsp freshly ground pepper