Instructions: Make the Pate Brisee: In the bowl of a food processor, combine flour, salt, and sugar. Add butter, and process until the mixture resembles coarse meal, 8 to 10 seconds. With machine running, add ice water in a slow, steady stream through feed tube. Pulse until dough holds together without being wet or sticky; be careful not to process more than 30 seconds.

To test, squeeze a small amount together: If it is crumbly, add more ice water, 1 tablespoon at a time. Divide dough into two equal balls. Flatten each ball into a disk, and wrap in plastic. Transfer to the refrigerator, and chill at least 1 hour.

On a lightly floured surface, roll out dough less than 1/8-inch thick. Use a 5-inch fluted cookie cutter to cut into rounds. Fit into five 4-inch nonstick tart pans. Transfer to refrigerator to chill for 30 minutes.

Preheat oven to 375 degrees. Heat oil in a large nonstick skillet over medium heat. Add bacon, and cook until fat renders and bacon is crisp and brown, about 8 minutes. Use a slotted spoon to transfer to paper towels to drain.

Add onions to the same skillet, reduce heat to medium-low, and cook, stirring frequently, until onions are dark golden brown, 30 to 45 minutes. Combine onions and bacon in a small bowl; set aside.

Divide half of the cheese evenly among the pans. Sprinkle with bacon and onion mixture, then top with remaining cheese. In a medium bowl, whisk together milk, cream, eggs, and egg yolk. Season with, nutmeg, salt, and pepper. Divide evenly among pans, pouring over cheese.

Transfer to oven, and bake until just set in the center, 30 to 35 minutes. Cool on a wire rack for about 10 minutes before serving.

This recipe yields 5 four-inch tarts.

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