Steam the potatoes in a large covered pan fitted with a steamer basket until they are tender, about 8 minutes.
In a large bowl mash the potatoes with the buttermilk and orange juice. Stir in the zest, salt, and nutmeg. Serve the potatoes topped with the butter, if desired.
Nutritional Analysis (Per Serving)
Total fat: 0g
Saturated fat: 0g
Monounsaturated fat: 0g
Polyunsaturated fat: 0g