Lemon Curd
["1 c. sugar", "6 Tbsp. sweet butter (unsalted)", "1/3 c. lemon juice", "1 Tbsp. finely grated lemon rind", "3 whole eggs plus 1 egg yolk"]
["In the top of a double boiler, combine the sugar, butter, lemon juice and lemon rind; mix well.", "Place the pan directly over the heat, stirring constantly, and cook until the sugar is completely dissolved.", "Remove from heat and cool slightly."]
["sugar", "sweet butter", "lemon juice", "lemon rind", "eggs"]