Sweet Potatoes

This is my Aunt Elaine's recipe:

1/3 cup brown sugar
1/3 cup sugar
2 tbsp corn starch
12 cup pineapple juice
2 1/2 cups orange juice

Put all dry ingredients in medium sauce pan. In small sauce pan, heat fruit juices. Bring to a boil. Then add to dry ingredients. Stir and bring to a boil, until thickened. Pour over cooked and peeled sweet potatoes. Bake at 350 degrees for 30 to 35 minutes.