We fell so in love with the Ritz crunch that we decided to start recipe testing a few pie options using it as a crust. As we delved deeper into the world of pies, we became obsessed with both the concept and the technique of Ohio Shaker pie (a traditional Americana pie, where thinly sliced lemons are tenderized without heat in sugar and a little salt) and key lime pie (the South’s best use of sweetened condensed milk, which naturally thickens with the acidity of the key lime juice). We tried as many different citrus fruits as possible, thinly sliced and layered with sugar into a pie shell, or juiced and stirred into sweetened condensed milk. Grapefruit was the clear winner, and it turns out that combining the two pie methods made for our favorite recipe—though instead of thinly slicing the grapefruit and candying it, we make grapefruit threads so you get the same tangy grapefruit pop in every bite of pie. This recipe is a little more involved than others in this chapter, but it’s delicious and worth a few more minutes of your time.

　　

Ingredients

Makes 1 (10-inch) pie; serves 8 to 10

　　1 recipe unbaked Ritz Crunch (page 53)

　　1 recipe Grapefruit Passion Curd (recipe follows)

　　1 recipe Sweetened Condensed Grapefruit (recipe follows)

　　

Step 1

Heat the oven to 275°F.

　　

Step 2

Press the Ritz crunch into a 10-inch pie tin. Using your fingers and the palms of your hands, press the crunch in firmly, making sure to cover the bottom and sides evenly and completely.

　　

Step 3

Put the tin on a sheet pan and bake for 20 minutes. The Ritz crust should be slightly more golden brown and slightly deeper in buttery goodness than the crunch you started with. Cool the crust completely; wrapped in plastic, the crust can be frozen for up to 2 weeks.

　　

Step 4

Using a spoon or an offset spatula, spread the grapefruit passion curd evenly over the bottom of the Ritz crust. Put the pie in the freezer to set the curd until firm, about 30 minutes.

　　

Step 5

Using a spoon or an offset spatula, spread the sweetened condensed grapefruit on top of the curd, being careful not to mix the two layers and making sure the curd is entirely covered. Return to the freezer until ready to slice and serve. Wrapped (gently) in plastic, the pie can be frozen for up to 1 month.

　　Reprinted with permission from Momofuku Milk Bar by Christina Tosi with Courtney McBroom. Copyright © 2011 by MomoMilk, LLC. Published by Clarkson Potter, a division of Random House, Inc. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.Christina Tosi is the chef and owner of Momofuku Milk Bar, called "one of the most exciting bakeries in the country" by Bon Appètit. As founder of the desserts programs at Momofuku, including Noodle Bar, Ssäat;m Bar, Ko and Má Pêche, Christina was most recently shortlisted for a James Beard Foundation Rising Star Chef Award. Christina and her confections have appeared on The Martha Stewart Show and Live! with Regis and Kelly, among others. She lives in Brooklyn, New York, with her three dogs and eats an unconscionable amount of raw cookie dough every day.