1. Preheat oven to 425 degrees F (220 degrees C).
2. Place bacon in a large skillet, and fry over medium-high heat until crisp. Drain on paper towels, then chop coarsely. Sprinkle bacon, cheese and onion into pastry shell.
3. In a medium bowl, whisk together eggs, cream, salt, sugar and cayenne pepper. Pour mixture into pastry shell.
4. Bake 15 minutes in the preheated oven. Reduce heat to 300 degrees F (150 degrees C), and bake an additional 30 minutes, or until a knife inserted 1 inch from edge comes out clean. Allow quiche to sit 10 minutes before cutting into wedges.
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