Mama's Candied Louisiana Sweet Potatoes

6 medium yams, parboiled in skin( I always peel mine first) 1 cup white sugar 1/2 cup brown sugar 1/2 cup water 1/2 stick butter or oleo 1/4 cup pecans, minced Dash of cinnamon Boil yams until almost tender when pricked with fork. Let cool and peel. Place in baking dish. Blend all other ingredients and cook over low heat until slightly thickened. Pour over yams and bake approximately 30 minutes at 350 degrees.