Ingredients

　　2 teaspoons dijon mustard

　　1 tablespoon finely grated lemon zest, plus 1/3 cup fresh lemon juice (from 3 lemons)

　　3/4 teaspoon coarse salt

　　1/4 teaspoon freshly ground pepper

　　3/4 cup extra-virgin olive oil

　　COMBINE MUSTARD, lemon zest and juice, salt, and pepper in a jar, then add some of the oil. Cover and shake to combine, then continue adding more oil and shaking until all the oil is incorporated and mixture is thickened and uniform in color. Serve immediately.

　　Reprinted with permission from Martha Stewart's Cooking School: Lessons and Recipes for the Home Cook by Martha Stewart. Copyright © 2008 by Martha Stewart. Published by Crown Publishing. All Rights Reserved.Martha Stewart is the author of dozens of bestselling books on cooking, entertaining, gardening, weddings, and decorating. She is the host of The Martha Stewart Show, the Emmy-winning, daily national syndicated program, and founder of Martha Stewart Living Omnimedia, which publishes several magazines, including Martha Stewart Living; produces Martha Stewart Living Radio, channel 112 on SIRIUS Satellite Radio; and provides a wealth of ideas and information on www.marthastewart.com.