
Peel and cube sweet potatoes. Place in a medium saucepan and add the orange juice. Add water to just cover. Season with salt and bring to a boil. Cook until tender, about 20 minutes. Drain, mash and cool for 10 minutes.
Preheat oven to 350°F.
Heat oil in a small frying pan and sauté diced onion until golden, stirring frequently. Add to sweet potatoes. Add mayonnaise, eggs and potato starch. Mix well and season to taste with salt and pepper.
Spread mixture into an 8-9" square baking dish. Bake for 30 Minutes or until top is set.
Mix 2 cups potatoes with oil and broth. Add egg and season to taste with salt and pepper. Place potato mixture into a piping bag fitted with a large star tip. Pipe potato mixture across the top of the pie in a pretty design. Return pie to the oven for an additional 30 Minutes.
Brush oil over the lattice and bake for 10 Minutes longer, until golden. Remove from oven and serve hot.
This dish can be made ahead of time and frozen.

