2 ea Sweet potatoes (Medium) cut 1 c Water 1/4 c Sugar 1/4 c Light brown sugar (packed) 4 T Unsalted butter 1 1/2 t Vanilla extract 1 x Juice and grated rind from 1 In a 1-quart saucepan combine sweet potatoes, water, sugars, 2 Tbsp of the butter; the vanilla and lemon juice and rind. Cover and cook over medium heat for 20 minutes, stirring occasionally; uncover and cook until potatoes are fork tender, about 10 minutes. Add the remaining butter, stirring until completely melted. Cook uncovered until sauce is thick, about 2 minutes more. Makes about 1 Cup.