Food & Cooking Recipes Quick & Easy Recipes Sour Lemon Sauce 3.8 (5) 1 Review By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on July 9, 2018 Print Rate It Share Share Tweet Pin Email Yield: 4 cups Ingredients 1 ½ cups sugar 3 tablespoons plus 2 teaspoons cornstarch Pinch of salt 7 tablespoons unsalted butter, cut into small pieces Finely grated zest of 2 lemons, plus 1/2 cup fresh lemon juice Directions Bring sugar, cornstarch, salt, and 2 1/2 cups water to a boil in a medium saucepan over high heat, whisking constantly. Cook, continuing to whisk, until mixture thickens, about 5 minutes. Stir in butter and lemon zest and juice. Cook, whisking, until smooth, 2 to 3 minutes more. Remove from heat and transfer to a bowl to cool completely. Sauce can be refrigerated up to 2 weeks in an airtight container. Rate it Print