Total time: 1 hour, 45 minutes, plus at least 1 day chilling
Note: Adapted from Thomas Keller's "Bouchon." You will need a 9-inch removable-bottom 2-inch deep tart pan or a 9-inch deep-dish pie plate.
3 pounds leeks (about 5)
6 ounces Roquefort cheese, crumbled (about 1 1/3 cups)
Basic quiche shell
Basic quiche batter
1. Cut off the dark green leaves from the leeks and discard. Cut off and discard the root end and bottom 1 inch of each leek. Cut the leeks lengthwise in half and wash well under cold running water. Place cut side down on a cutting board and slice crosswise into 1/4 -inch-thick slices. (You should have 4 to 5 cups packed leeks.)
2. Bring a large pot of salted water to a boil. Add the leeks and cook for about 5 minutes, or until tender. Drain the leeks and spread them on a baking sheet to cool. Place a rack in the center of the oven and heat the oven to 325 degrees.
3. Squeeze the cooled leeks to remove excess water and dry on paper towels. Scatter half the chopped leeks and half the Roquefort evenly into the hot quiche shell (still on the jelly roll pan).
4. Blend the quiche batter again to aerate it, then pour in enough of the batter to cover the ingredients and fill the quiche shell approximately halfway. Top the batter with the remaining leeks and cheese. Blend the remaining batter once more and fill the quiche shell all the way to the top (if you don't have a very steady hand, you might spill some of the batter on the way to the oven; fill the shell most of the way, then pour the final amount of batter on top once the quiche is on the oven rack). You may have some batter left over. Bake for 5 minutes. The filling level will drop. Pour in the remaining batter to fill to the top; there may be a little left over.
5. Bake for 1 hour, 15 minutes, until the top of the quiche is browned and the custard is set when the pan is jiggled. Remove the quiche from the oven and let stand 15 minutes before serving, or cool, then refrigerate until chilled, at least 1 day, or up to 3 days.
6. Once the quiche is thoroughly chilled, using a metal bench scraper or a sharp knife, scrape away the excess crust from the top edge. Place a large bowl upside down on a work surface and place the quiche pan on top of that. Gently remove the outside ring, working it free in spots with a small knife if necessary. Return to the refrigerator until ready to serve.
7. To serve, heat the oven to 375 degrees. Line a baking sheet with lightly oiled parchment paper. Using a long serrated knife, and supporting the sides of the crust with your opposite hand, carefully cut through the edge of the crust in a sawing motion. Switch to a long slicing knife and cut through the custard and bottom crust. Repeat, cutting the quiche into 8 to 10 pieces. Place the pieces on the baking sheet and reheat for 15 minutes or until hot throughout. To check, insert a metal skewer into the quiche for several seconds and then touch the skewer to your lip to test the temperature of the quiche.
Each serving: 614 calories; 14 grams protein; 32 grams carbohydrates; 2 grams fiber; 49 grams fat; 28 grams saturated fat; 260 mg. cholesterol; 862 mg. sodium.