Lemon Curd
["4 Tbsp. butter", "1/2 c. sugar", "1/2 c. lemon juice", "4 egg yolks", "1 Tbsp. grated lemon peel"]
["Combine first 4 ingredients in heavy pan and cook over lowest heat until mixture thickens enough to coat a spoon.", "Do not let it boil.", "Add lemon peel.", "Refrigerate until ready to use as tart or jelly roll filling.", "Yield:", "1 cup."]
["butter", "sugar", "lemon juice", "egg yolks"]