Preheat oven to 350 degrees F.
Use one tablespoon of butter to grease
a 9 by 13-inch baking or gratin
dish. Mix together orange juice
, brown sugar, and spices
, then add pineapple. Layer slices of sweet potatoes in the dish, then dot
with butter. Top with pineapple mixture. Season each layer with salt and pepper. Repeat this process until all sweet potatoes
are used up, ending with pineapple mixture.
Bake in oven for 40 to 45 minutes until sweet potatoes are tender when a pairing knife is inserted. Baste
gratin with excess juices every 10 minutes. The top should be bubbly and brown. If the top gets too brown or starts to burn, cover with aluminum foil and continue cooking until sweet potatoes are done.