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Step One: Grate zest from lemons to equal 2 Tbsp. Cut lemons in half; squeeze juice into a measuring cup to equal 1 cup.
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Step Two: Beat butter and sugar at medium speed with an electric mixer until blended. Add eggs, 1 at a time, beating just until blended after each addition. Gradually add lemon juice to butter mixture, beating at low speed just until blended after each addition; stir in zest. (Mixture will look curdled.) Transfer to a 3-qt. microwave-safe bowl.
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Step Three: Microwave at HIGH 5 minutes, stirring at 1-minute intervals. Microwave, stirring at 30-second intervals, 1 to 2 more minutes or until mixture thickens, coats the back of a spoon, and starts to mound slightly when stirred.
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Step Four: Place heavy-duty plastic wrap directly on warm curd (to prevent a film from forming), and chill 4 hours or until firm. Store in an airtight container in refrigerator up to 2 weeks.
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Stove-Top Method: Prepare as directed through Step 2, transferring mixture to a heavy 4-qt. saucepan. Cook over medium-low heat, whisking constantly, 14 to 16 minutes. Proceed as directed in Step
